sailboat gelcoat repair

Boat Reviews

• Boats Specs
• Marine Pros
• Boat Insurance
• Boat Warranties
• Boat Transport
• Boat Towing
• Marine Forecasts

Your Ultimate Boating Resource

Gelcoat Repair Guide: Everything Boat Owners Need to Know

Boat ownership comes with a unique set of responsibilities and concerns, one of which is maintaining the boat’s gelcoat. This protective layer can encounter damage due to various factors, leading to the need for repair. This comprehensive guide will walk boat owners through everything they need to know about gelcoat repair, including understanding what gelcoat is, recognizing when it needs repair, and step-by-step instructions on how to perform a gelcoat repair.

Understanding Gelcoat

Gelcoat is a layer of pigmented resin applied to the exterior of boats, most commonly used on fiberglass boats. This layer serves not only as a decorative finish but also as a protective barrier against the boat’s exposure to the harmful elements of water, sunlight, and general wear and tear. Over time, the gelcoat may become worn, cracked, or damaged, necessitating repair.

Why is it Important to Repair Gelcoat Damage?

There are several reasons why repairing gelcoat damage is essential:

• Protection : The gelcoat provides a defense against water intrusion, harmful UV rays, and abrasion. Damaged gelcoat may no longer fully protect the boat, leading to more extensive damage and costly repairs.
• Aesthetics : A well-maintained gelcoat maintains the overall appearance of the boat, increasing the resale value and making the boat more appealing to potential buyers.
• Prolonging the life of the boat : Repairing minor gelcoat issues before they become significant problems can have a substantial impact on the life of the boat.

Identifying Gelcoat Damage

Before repairing a damaged gelcoat, it’s important to recognize the different types of damage that may occur. The most common types of gelcoat damage include:

• Scratches : Gelcoat scratches occur from normal wear and tear or coming into contact with a sharp object.
• Cracks : Stress cracks, also known as spider cracks, are small cracks that radiate outward and often appear near fittings or high-stress areas.
• Chips : Gelcoat chips occur when an impact or pressure displaces a small section of gelcoat.
• Gouges : A gouge occurs when a sharp object penetrates the gelcoat and may involve damage to the underlying fiberglass.
• Oxidation : Over time, the gelcoat may become dull or chalky in appearance due to exposure to the elements.

Preparing for Gelcoat Repair

Before embarking on a gelcoat repair project, gather the necessary tools and materials:

• Gelcoat repair kit or marine-grade polyester resin
• Pigment (if coloring the resin)
• Wax paper or plastic wrap
• Mixing cups and stir sticks
• Sandpaper (ranging from 220 to 600 grit)
• Razor blades and/or utility knife
• Wet or dry sandpaper (600, 800, and 1,000 grit)
• Polishing compound and wax
• Buffing pad and electric buffer (optional)
• Protective gear (gloves, eye protection, respirator or dust mask)

Performing a Gelcoat Repair: Step-by-Step Instructions

Follow these steps to repair gelcoat damage effectively:

Step 1: Clean the Damaged Area

Thoroughly clean the damaged area to remove dirt, grime, and wax using a mild soap and water or a marine-grade cleaner. Rinse with clean water and allow the area to dry completely.

Step 2: Assess the Extent of the Damage

Determine the level of repair needed based on the type of damage. For small, shallow scratches or oxidation, sand and buff the area. For stress cracks, chips, or gouges, proceed to fill and repair.

Step 3: Sand the Area

Using 220-grit sandpaper or a sandpaper suitable for the level of gelcoat damage, sand the area surrounding the damage. Be careful not to sand too deep, as this may expose the underlying fiberglass.

Step 4: Mix the Repair Material

Following the manufacturer’s instructions, mix the gelcoat or polyester resin with the pigment to match the boat’s color. Add the hardening agent and mix thoroughly.

Step 5: Fill the Damaged Area

For scratches or small cracks, apply the gelcoat mixture using a toothpick or small brush. For larger areas, such as chips and gouges, use a small putty knife to press the mixture into the area. Be sure the mixture fully infiltrates the damage.

Step 6: Cover the Repair

Apply a sheet of wax paper or plastic wrap over the repair, smoothing it flat against the surface of the boat. This helps ensure a smooth finish.

Step 7: Allow the Repair to Cure

Following the manufacturer’s guidelines, allow the repair to cure. This time may vary based on temperature and humidity.

Step 8: Remove the Covering and Shape the Repair

Peel away the wax paper or plastic wrap and inspect the repair. If necessary, use a razor blade or utility knife to trim excess material and shape the repair to match the surrounding surface.

Step 9: Sand and Polish the Repair

Progress through sanding with increasingly fine grits of wet or dry sandpaper, starting with 600 grit and finishing with 1,000 grit. Rinse and dry the area between grits. Finish by applying polishing compound and wax, buffing the area to a high gloss.

Maintaining your boat’s gelcoat is an essential aspect of boat ownership. Regular inspection and repair of gelcoat damage can prolong the life of your boat, maintain its appearance, and ensure ongoing protection. With the proper tools, materials, and knowledge, boat owners can confidently undertake gelcoat repairs and keep their boats looking and performing at their best.

RELATED ARTICLES

Overview of the 2024 sea-doo rxp-x 325, overview of the 2024 parker offshore 2900 cc, what your boat’s beam is and why it matters, power cats of 2024: ultimate guide to the top power catamarans this year, navigating the heat: 10 safety tips for a safe boat ride in the summer heat, latest posts, don't miss, our newsletter.

Get the latest boating tips, fishing resources and featured products in your email from BoatingWorld.com!

What type of wood is used for pier pilings?

What is the difference between a dock and a floating pier, what is the proper technique for pulling a beginner wakeboarder, what does ‘no wake’ mean on a lake, what is the difference between wash and wake, highs, lows, and tidal know-how: a deep dive into ocean currents, 10 essential tips for fishing near private property, the benefits of using a drift sock: guidance for anglers, lure fishing: secrets for imitating live bait and attracting fish, explore the untapped depths of america’s best bass fishing spots, outboard motor maintenance: tips for keeping your engine in top shape, the essential boat tool kit: tools every boater needs, diy boat building: 8 tips and tricks for building your own vessel, the art of miniature maritime craftsmanship: ship in a bottle, antifouling paints: a guide to keeping your boat shipshape, beginner’s guide to standup paddle boarding: tips and techniques, boating for fitness: how to stay active on the water, kayak safety: how to stay safe on the water, anchoring in a kayak or canoe: how to secure your small boat, overview of the 2024 yamaha 252sd, overview of the 2024 tiara yachts 48 le, overview of the 2024 bass cat jaguar sts, 2024 pursuit os 445: an overview, 2024 aquila 47 molokai review, 2024 sea-doo switch 13 sport review, gear reviews, megabass oneten max lbo jerkbait review, fortress anchors fx-7 anchoring system review, fortress anchors fx-11 anchoring system review, fortress anchors commando anchor kit review, fortress anchors aluminum anchors review, stay in touch.

To be updated with all the latest news, offers and special announcements.

• Privacy Policy

• Boat Accessories
• Where to Buy

Special until July 31st: 24% off all products. Use Code JULY24 at checkout. *restrictions apply

Free ground shipping in the Continental US for any orders over $150!

Sailboat Gelcoat Repair Guide...

Sailboat gelcoat repair guide.

No sailboat should be without a quality gelcoat to maintain the durability and sheen of its fiberglass. But not every sailboat has the advantage of going through its journey completely scratch-free. That’s why we’ve put together a quick sailboat gelcoat repair guide. We hope these tips will help you understand how to handle a problem with your sailboat’s gelcoat and give you a few insights into handling the entire hull as well.

Start With The Right Materials

Liquid LifeSeal® Sealant 5.2 fl. oz. Clear

Stainless Steel Cleaner 16 fl. oz.

Related blogs, updated how to use “git”-rot.

**This is an update to a previous post, “How to Use “Git”-Rot””.  The presence of wood rot can ruin any […]

Thanksgiving Trivia!

Happy Thanksgiving! Thanksgiving is one of America’s oldest and most loved holidays. Although the story is steeped in a dark […]

Detailing Your Boat

On a warm summer day with the sun shining, there’s no better way to spend your time than by hitting […]

All products proudly made in the usa

Practical Boat Owner

• Digital edition

Gelcoat repair: How to make an invisible repair

• Alison Wood
• August 21, 2023

Everything you need to know to make an invisible gelcoat repair, from preparation and filling to topcoat and polishing

Most boats will get a ding from time-to-time, especially racing boats. Photo: Michael Austen/Alamy

How can you repair a scratch or dent to the hull yourself, and when is it time to call in the gelcoat repair experts? Ali Wood looks at the options…

Chances are, if you own a GRP boat at some point you’re going to have a ding, resulting in scuffs, scrapes and dents. Or in the case of Maximus , our PBO Project Boat , you might inflict gouges yourself with some over-eager antifoul paint scraping !

Don’t panic, the beauty of composite hulls is they’re easy to repair – although getting a smooth finish and the correct colour does require precision. Before starting a gelcoat repair it’s worth understanding how GRP boats are made, and why gelcoat is so important.

Hull construction

Composite hulls are made from two or more materials with different chemical properties which, when combined, create new characteristics. This may be resin combined with glass fibres (GRP) but there are other types too, such as carbon fibre and ferrocement, or wood combined with epoxy resin.

Sandwich construction, which you find in Sadlers and Etap yachts, is also considered composite. Here you might have a balsa or foam core sandwiched between skins of GRP. These hulls are well insulated and unsinkable as their foam core provides buoyancy.

How osmosis occurs

GRP layers are known collectively as a ‘laminate’, and during production small voids, air pockets and micro cracks will form within the resin and at the interface of the resin and glass fibres.

All laminates will allow water molecules to pass through, but where the water gets trapped it can break-down components in the laminate such as acids and alcohols. It’s these tiny concentrated pockets of solution where osmosis (hull blisters) begin.

Most GRP boats are finished with a thin (0.25 – 1mm) outer skin of gelcoat, which is made of polyester resin. As this dries, it hardens, creating a shell-like layer over the fibreglass, protecting the hull from water, UV damage, chemicals and scratches.

If you maintain your boat regularly, gelcoat can protect the hull for a decade or two, but it does go chalky over time, which is when you’ll want to polish your gelcoat .

Moisture in the hull

Our Maxi 84 Project Boat is made of woven roving and chopped strand mat (CSM) and coated with an off-white gelcoat backed with polyester resin.

When we invited marine surveyor Ben-Sutcliffe Davies to survey Maximus , he brought along his moisture meter.

Ben measures moisture levels in Maximus ’s hull

Ben explained that when laminate gets saturated it loses about 25% of its strength and that’s when you start to see high moisture readings.

Fortunately, Maximus scored between 15 to 30, so was considered dry.

Anything above this would suggest moisture-related defects not yet detectable, and by the time you get to 46-60 you should expect to see signs of moisture damage.

Over 61 and there’s likely laminate damage as well as osmotic blistering .

Stress cracks in gelcoat can form around deck fittings – although repairs aren’t deemed necessary here

Gelcoat checks

When inspecting your hull check for chips in the gelcoat that may need filling, and surface scratches if noticeable.

Cracks in the gelcoat might indicate damage beneath or stress caused by a deck fitting, for example.

Blisters on the hull, as noted already, are a sign of osmosis. If you’ve owned the boat for a few years, check if these are getting worse.

If there are just a few, you may be able to deal with them by grinding them out, leaving the laminate to dry, and then filling it.

These hull gouges will be easily fixed with epoxy filler and no colour-matching is required as we’ll be antifouling over the top

When Ben inspected Maximus he suggested the topsides were in need of a compound and polish.

He also pointed to a gelcoat repair that didn’t match the original colour and an area that had been sanded too far back.

“They’ve actually started going through to the laminate below,” he advised. “You’ve got to be very careful about doing much more here in the way of T-cutting.”

This gelcoat repair in Maximus wasn’t colour-matched

Repairing gelcoat

A gelcoat repair isn’t always critical right away. If you get a ding, you can usually wait until the boat’s next in the yard. However, if the damage has gone through the gelcoat, exposing the laminate, a temporary repair with gelcoat filler should prevent water ingress.

But what happens if you ignore gelcoat damage? Aaron Logan of Small Boat Services warns that over time water will wick into the laminate and the more moisture there is in the hull the bigger the repair will be.

Fixing a small dent in Maximus’s gelcoat. Sadly we didn’t get the colour-matching quite right!

“Your boat’s not going to sink but that £400 repair will be £500 the following year or worse,” he warns. He adds that it’s impossible to cost a gelcoat repair without seeing the damage.

The unit price can be quite high even for a small repair, and ironically you may get ‘more for your money’ repairing a bigger area.

Price varies too according to the colour of the gelcoat. A professional repair is a full day’s work or longer. Once the boat’s laid up, if you decide to do a gelcoat repair yourself the temperature needs to be over 16°C otherwise the gelcoat won’t harden.

This isn’t usually compatible with a British winter, but you may be OK if you can find boat storage under cover.

Epoxy or resin?

There are two main types of resin for repairs: epoxy and polyester. Each has different properties: polyester, for example, is combined with a catalyst in order to bond, whereas epoxy is combined with a hardener.

It’s essential the catalyst or hardener is mixed thoroughly to ensure an even cure. Polyester is much cheaper but epoxy is stronger and resistant to osmosis. For longer-lasting repairs, especially below the waterline, epoxy is the best option.

West System repair kit

Gelcoat repair kits

PBO expert Stu Davies keeps both types of resin on board. For minor dents and scratches, he uses Osculati White Gelcoat (polyester-based). It works like a regular filler. “Just paste it on then rub with 800-grit, going up to 1200, 1800 and 2500, then finish with a polish,” he says.

For larger repairs on his Beneteau, Stu uses epoxy-based West System Fibreglass Repair kit . He warns that for the perfect colour-match, though, he’d still pay a professional to do the job.

“No boat is ever just generic white,” he says. “Check to see if there’s a colour code given on a data plate in the cockpit then tell that to the repairer.” If you decide to do a repair yourself the most economical way would be to order a kit with small quantities of everything you need.

East Coast Fibreglass Supplies sells a white or black gelcoat repair kit which includes polyester isophthalic gelcoat, along with mixing cups, sticks, wet and dry paper, protective equipment, acetone, UV wax and polishing compound. For non-white hulls, you need to select the clear resin option and add pigment. A full list of colours is on their website.

West System, on the other hand, sells a fibreglass repair kit using epoxy resin. This includes plain weave and biaxial glass so you can cover a range of repairs from dinks to bigger holes.

Note: We may earn a commission when you buy through links on our site, at no extra cost to you. This doesn’t affect our editorial independence.

Step-by-step gelcoat repair, gelcoat repair step 1: preparation and matching the colour.

The first job in any gelcoat repair is to check the damage closely, both inside and out. Sometimes a hard knock can cause delamination within the hull, in which case a more serious repair will need to be carried out first. In this example damage to the hull at the stem is fairly typical of a modest dockside shunt, and proved to be cosmetic rather than structural.

If the edges hadn’t been sharp we’d have first had to remove any loose material with a Skarsten scraper. As it is, in this case we can simply give the damage and the surrounding area a good wipe over with acetone to remove any wax or dirt.

Before any repair is made you need to know the true colour of the hull – there’s no point matching a repair to a faded pigment which will change when it’s polished. Ideally, then, you need to polish the hull back to as close to its original colour as possible. Chalking and superficial scratches had already been polished out of our example boat’s hull, so we have a true colour to work to. If it had been an untreated hull we’d have needed to prepare a small area first.

1. First choose a part of the hull identical in colour to the damaged area. This will become the mixing palette on which to colour-match the gel coat. Go over the area with 1,000-grit abrasive paper to remove scratches and chalking.

2. Using a rubbing compound, the area is then flatted to restore the original colour of the gel coat, leaving it with a slightly matt finish.

3.Enough plain white pigment is decanted to complete the entire repair. A small amount will be placed onto the prepared palette area.

4.The hull may appear white, but look closely to see what colour tints might be necessary for a perfect match – in this case a hint of green, with a trace of yellow and a touch of cream.

5. Using a mixing stick, place a few dabs of uncatalysed white gel coat onto the hull. These will become your testers (because they haven’t been activated with catalyst, they can later be wiped off with acetone)

6. Now for the tricky bit. A tiny dab of the dominant colour is placed on the end of a cocktail stick…

7. … and is then mixed into the tester. Care is needed to ensure all the pigment is evenly distributed, which requires some dexterity.

8. When you are confident you have the green element of the match, you can then switch to the next colour, cream, and repeat the process. If the match goes wrong, start again.

9.Throughout the process, keep a mental note of how much of each pigment you have used for the match. When you’re happy with the result, use this experience to multiply the ratios to make a full batch of gel coat, enough to complete the whole repair.

Gelcoat repair step 2: Filling the hole

Once mixed, the colour-matched batch is then split, with some being kept back for the finishing coat. The majority will be used for the initial fill, and here a filler powder is added to bulk out the gel coat so it stays put, making sure the colour remains the same.

As a check, it can be dabbed back onto the hull at any stage. It’s important that the entire repair is colour-matched and not just the surface layer. That way if the hull is abraded back any time in the future, the repair will remain invisible.

1. The repair site on the stem is masked off to protect the stainless steel strap. Note strips of cardboard used to make small cofferdams.

2. The thickened mix then receives some catalyst at a ratio of 1%. It’s important not to add any more than this to hasten the cure. The heat generated by a fast cure can actually alter the colours, making them darker.

3. The colour-matched filler is then thoroughly stirred together to make sure all the catalyst is mixed in…

4. …before being applied firmly to the holes with a flat scraper. The excess is then taken off with the scraper’s leading edge until the filler is standing just slightly proud.

5. Once fully cured, the area is then sanded back flat with 240-grit paper on a sanding block. Using a block is best as pressure from fingertips and sandpaper alone can sometimes produce an uneven finish.

6. With the area flatted, it can then be tidied as shown here, making the edge of the repair smooth. The masking tape stays on the stainless strap to protect it from scratches.

7. The next job is to go over the repair with a random-orbit sander fitted with a 400-grit disc. This will match the final blend of the filler to the rest of the hull, and give a super-smooth surface for the last stages.

Gelcoat repair step 3: Applying the topcoat

The critical stage is to apply the topcoat. This is our last batch of colour-matched gel coat, and it is unthickened. The addition of a little wax-in-styrene (2%) before the catalyst is added will slightly improve the flow, and make the curing easier.

1. A 2% addition of wax-in-styrene is mixed into the final batch of gel coat. It is stirred well, and then the catalyst is added.

2. Now gently paint your activated gel coat over the whole repair, avoiding brush marks and making sure you get a fairly wide coverage.

3. Once the topcoat has dried, usually in about an hour, the masking tape can be removed. The surface is given a wipe down with acetone to remove the wax, and also any splashes that may have got under the tape. The metal is colder than the hull, so gel coat splashes on it might still be quite soft and easy to remove.

Gelcoat repair step 4: Final polishing

1. Using a sanding block again, a 400-grit paper gently flattens off the topcoat, not forgetting details such as the edges around the strap.

2. Switching to a finer 800-grit paper, the repair is now machine-sanded, paying attention to the stippled edges. Everything is done in short bursts, and with great care.

3. The final stage is with a 3,000-grit abrasive disc. This can bring out a perfect shine by itself – but one final stage is yet to come.

4. Polishing compound is now applied with a brush. Adding a little solvent to the mix makes the polishing compound smoother and workable for longer.

5. Using a lambswool buffing head on a slow- running rotary polisher, the repair is given a final polish to really bring out the shine.

6. Job done. A layer of UV protective wax can now be applied to protect the hull – and its invisible repair – from UV fading.

Gelcoat repair: Top tips

• The catalysed gel coat will set in about 30 minutes, but the cure could be accelerated by heat from the hand. If you don’t want this to happen, hold the mixing pot by the rim.
• Once the wax and catalyst have been thoroughly mixed, tap the container a few times on the worktop and let it stand for a few seconds. This allows any air bubbles to make their way to the surface. Bubbles trapped during application will leave pinprick voids in the finish.
• Use the brush to stipple around the edges of the topcoat. This will give you a seamless merging of the gel coat with the surrounding hull when it has been sanded back.

Coloured hulls

This repair has been to a ‘white’ hull, but exactly the same principles apply to pigmented hulls. The only major difference in that case is that you would use a clear gel coat to carry the deep colours required, rather than a white one. To bulk out a clear coat, a colloidal silica would be used instead of the filler powder we used for this job.

Thanks to Aaron Logan of Small Boat Services , and to Hayling Yacht Company for the loan of their shed.

Alternatively you can read how to do a simpler colour match using a clear kit you can buy from a chandlery below

Gelcoat repair colour matching – the quick way

A basic colour match may not be perfect – but in most cases it’ll do the job and is much…

WELCOME TO Elite Marine specialists

Let our 50 ton lift haul your vessel, servicing boats from 18' to 80' since 1998..

Elite Marine Specialists is a full service boat yard in St. Petersburg, Florida. We have been serving the community with yacht restoration and boat maintenance services since 1998. Let our company get you back on the water right in time for summer! We are experienced and have the know how to solve a wide range of problems that might be happening with your vessel.  Need a full service boat yard in St Petersburg, call (727) 289-7019 today!

Carl Humbert

Owner/President

Yard Manager

Master Craftsman

Administration

Our Services

Here are a few of the services we offer and much, much more: Inboard/Outboards, Stern Drives, Gas or Diesel Motors Installs or Repairs - Service, Repair & Maintenance - Repower - Fiberglass / Gelcoat Repair - Topside Paint - Electrical - Electronics Install - Bottom Paint - Running Gear - Pressure Washing - Cutlass Bearings - Prop Reconditioning - Interior Renovation - Custom Fiberglass Parts - Woodwork - Upholstery - Vessel Loading / Unloading - Bow Thrusters  ...     Call us today for an estimate: (727) 289-7019 .

Electrical Systems

From troubleshooting battery problems to a complete rewire with custom electrical distribution panels. We can design a system to accommodate your needs, and make your electrical panel beautiful and service accessible.

Bottom Work

Elite offers a full spectrum of options for your bottom paint applications, from premium paint, to peels and blister repairs. We can utilize the application that best suits your needs and your budget.

Fiberglass, Gelcoat & Paint

From simple Gelcoat repairs to custom parts, Elite Marine has the experience and skill to take care of your needs. (Hurricane storm damage repairs, Bow Thrusters, Mezzanines, Swim platforms, Transom Doors, Deck Recore, Hard Tops, Fish Boxes, Imron - AWL Grip Paint Applications, Complete Interior Renovations.

From a standard engine maintenance service, to a complex, "they say it can't be done" repower, our capable crew will get your vessel ready to cruise or create that "head turner" you've always wanted. We can service anything from small outboards to large inboard diesels. Our mechanics don't cut corners when it comes to engines.

Get in touch

How to do Gelcoat Repair on Boats

• Uncategorized
• May 19, 2023

It’s a daunting task to tackle gelcoat repair on boats. I’ve seen my fair share of boats and the wear and tear that comes with them. Over time, gel coats on boats can become cracked or chipped, leaving the boat looking worn down and worse for wear. Fortunately, it doesn’t have to stay that way; with some elbow grease and know-how, anyone can learn how to repair gel coat on boats. In this guide, we’ll cover everything you need to know, from preparation tips to tools required and steps to take. So let’s get started!

Overview Of The Process

The process of restoring your boat’s gel coat starts with understanding what exactly needs to be repaired – whether it’s scratches or chips in the surface of the gel coat that need buffing out or more serious damage requiring patching up. Then, with the right know-how, it can be done smoothly like butter on bread. Either way, certain steps should be taken before beginning any gelcoat repair procedure.

Once you’ve identified the issue and any tools needed for the job, you’ll know what materials will work best for your specific project – whether it’s epoxy resin patches, sandpaper pads, compound waxes, etcetera. Knowing this information beforehand helps make the entire gelcoat repair process much easier than going in blind.

Preparation For Gelcoat Repair

Before you start gelcoat repair on your boat, it’s important to prepare the work surface properly. This will make the gelcoat repair process go smoother and ensure the long-term success of the fix. 

Here are some steps for prepping your boat before beginning a gelcoat repair:

• Use a non-abrasive cleaner to remove dirt, debris, and oils from the repaired area. You may need to use an orbital sander with light pressure to get rid of tougher stains or oxidation build-up.
• Rinse any residue left behind after cleaning with fresh water to avoid introducing contaminants into the gelcoat repair mix.
• Sand down around the damaged area until you reach bare fiberglass; this is necessary for providing a good adhesive bond between the new gel coat and the existing material.
• Apply wax or mold release agent over all nearby surfaces that could be affected by overspray during the application, so they don’t stick together when dry.

After thoroughly preparing your boat, you can begin assessing damage and continuing with your gel coat project.

Identifying Damage

Marine fiberglass technicians need to be able to identify damage on boats accurately. To ensure that gelcoat repair is done correctly and safely, it’s important to recognize those damages early. 

Below is a table showing common types of boat gel coat damage:

Damage Type Description Prevention Tips

	Loss of color due to sun exposure   Hairline cracks that typically appear near the water line   Tiny blisters along the surface from moisture trapped beneath the gel coat layer	Keep your boat out of direct sunlight when possible; wax regularly with UV protection wax Inspect your hull often for signs of cracking; use proper grade epoxy resin filler during the repair process.   Check the condition of the gel coat frequently; use proper ventilation when storing your vessel indoors

Knowing how to spot potential problems before they become severe gives you an advantage in ensuring your vessel maintains its value and integrity over time. 

Applying The Gel Coat

Repairing boat gel coat damage requires the right materials and a few steps. First, prep the area to be repaired by cleaning it thoroughly with soap and water. Next, use sandpaper to remove loose fibers or old gel coats from the boat’s surface. Sand until you’ve created a clean, smooth patch ready for gelcoat repair. Once prepped, mix up your gel coat according to product instructions and apply using a squeegee or brush. Make sure to fill in all cracks and crevices before applying additional coats. Lastly, focus on achieving an even finish, as this will help ensure lasting protection against further damage.

Finishing Touches

After applying the gel coat, it’s time to add those finishing touches to make your vessel look new again! Here are some steps you can follow to achieve this goal:

• Polishing: Use a high-grade polisher and wax combination to buff out any scratches or imperfections on the surface.
• Waxing: This will help protect the finish from UV damage and provide an extra layer of shine.
• Buffing: Use a soft cloth and light pressure when buffing the gel coat for the best results.
• Cleaning: A routine with soap, water, and a sponge will keep dirt and other debris off of the boat’s hull.
• Sealing: Finally, apply a sealant product specifically designed for fiberglass boats to further protect your vessel from wear and tear caused by elements such as sun exposure and saltwater spray.

Frequently Asked Questions

What Type Of Tools Are Needed For The Gelcoat Repair Process?

Marine repair tools are essential when working with any kind of boat gelcoat repair project, and having quality supplies can make all the difference in achieving professional-level results.

For starters, abrasives like sandpaper and grinding discs will be required to remove surface imperfections from the boat’s hull before applying a new gel coat. Sanding blocks and specialty scrapers can also smooth out scratches and dings that have occurred over time. Orbital buffers work great at restoring areas where a lot of material has been lost due to wear or other causes.

Is It Possible To Use A Different Type Of Material Instead Of Gel Coat?

Gelcoat has traditionally been the go-to option when it comes to gelcoat repair on boats, but there may be alternative materials that offer advantages over traditional methods. Factors such as flexibility, corrosion resistance, UV protection, heat resistance, and impact toughness must all be considered when selecting an alternate material for boat repairs. Additionally, depending on the severity of damage caused by wear and tear or accidental impacts, certain characteristics may need to be prioritized over others to ensure successful results with your chosen repair product.

How Long Does The Gelcoat Repair Process Typically Take?

It might seem like an eternity until you finally get your boat looking good as new again! Whether you’re talking about boat repair time or even just considering how long repairs will typically last when using a gel coat, it’s enough to make anyone want to pull their hair out in frustration. Some factors may affect the duration of the job – such as age, size, and condition of the boat – but with proper expertise and preparation, you could be sailing away sooner than expected! 

Is The Repair Process Suitable For A Novice?

It’s no surprise that gel coat repair is a tricky process, but whether it’s suitable for a novice may be a bit more complicated. If you’re an absolute beginner in boat repair, I’d suggest leaving the job to the pros. 

If you’ve got a good grasp of these concepts and feel confident about tackling the project yourself, go ahead! With patience and practice, even novice boat owners can get up to speed when applying for their gel coat patching or restoration work. The key is simply taking your time during each step of the process to ensure everything is done properly, from prepping the area correctly to finishing with proper coating procedures.

Is The Gelcoat Repair Process Suitable For All Types Of Boats?

Different boat materials require different repair processes and expertise levels. For example, suppose you are working with fiberglass or composite material boats. You need someone with experience dealing with these materials and their unique characteristics when performing repairs. If you do not have the necessary skillset or knowledge base to perform this work, it would be best to seek professional help from an experienced marine fiberglass technician.

The process of repairing gel coats on boats is a challenging one. But, with the right tools and some knowledge, it can be a breeze to tackle! When completing this repair job, the most important thing is to ensure you have everything you need beforehand and take your time throughout each step.

Hopefully, you’ve learned so much on how to repair gelcoat on boats properly. Contact us if you need comprehensive boat repair or maintenance.

gelcoat repair on boats

How Often Should You Do Yacht Cleaning

Maintaining a yacht’s cleanliness is essential for its appearance, performance, and longevity. Just as you regularly care for your car or home, yacht cleaning demands

8 Boat Cleaning Hacks In Sarasota You Need to Know

Owning a boat in Sarasota is a source of pride and endless enjoyment, offering the thrill of adventure on open waters and moments of serene

7 Essential Tips to Protect Your Beloved Boat From a Sarasota Florida Storm

Florida is a haven for boating enthusiasts, with its stunning coastline and numerous waterways that beckon sailors year-round. However, this idyllic boating destination is also

The Boat Concierge is your trusted source in Sarasota for all your boating needs. We make boat ownership easier for you with our expert team and services.

Contact Information

• Phone: (941) 347-2628 (BOAT)
• [email protected]
• Address: PO BOX 3756 Sarasota, FL 34230

Keep in touch with us

• PRO Courses Guides New Tech Help Pro Expert Videos About wikiHow Pro Upgrade Sign In
• EDIT Edit this Article
• EXPLORE Tech Help Pro About Us Random Article Quizzes Request a New Article Community Dashboard This Or That Game Happiness Hub Popular Categories Arts and Entertainment Artwork Books Movies Computers and Electronics Computers Phone Skills Technology Hacks Health Men's Health Mental Health Women's Health Relationships Dating Love Relationship Issues Hobbies and Crafts Crafts Drawing Games Education & Communication Communication Skills Personal Development Studying Personal Care and Style Fashion Hair Care Personal Hygiene Youth Personal Care School Stuff Dating All Categories Arts and Entertainment Finance and Business Home and Garden Relationship Quizzes Cars & Other Vehicles Food and Entertaining Personal Care and Style Sports and Fitness Computers and Electronics Health Pets and Animals Travel Education & Communication Hobbies and Crafts Philosophy and Religion Work World Family Life Holidays and Traditions Relationships Youth
• Browse Articles
• Learn Something New
• Quizzes Hot
• Happiness Hub
• This Or That Game
• Train Your Brain
• Explore More
• Support wikiHow
• About wikiHow
• Log in / Sign up
• Cars & Other Vehicles

How to Repair Gelcoat

Last Updated: April 7, 2023

This article was co-authored by Travis Lund . Travis Lund is the General Manager at the Vallejo Marina, a large marina located between the San Francisco Bay and the Delta in California. Sailing since he was six-years-old, Travis has over 15 years working in sailing operations and instruction and has pioneered a coaching platform that combined traditional coaching with multi-camera video support. He studied English at Michigan State University, where he was on the sailing team. This article has been viewed 47,196 times.

Gelcoat is the protective coating that covers the fiberglass of boats and other watercraft. When you get a gouge or a scratch in the gelcoat of your fiberglass, you will have to clean it up by grinding or sanding before you can repair it. Then, you’ll need to buy a wax gelcoat repair kit that matches the color of your gelcoat and carefully apply it to the damaged area. To finish the job off, sand it again until it is completely smooth, then buff and wax it to get it looking like new.

Cleaning Up the Damaged Spot

• A Dremel tool is a rotary tool that you can attach all kinds of bits to for things like sanding, grinding, and polishing. A burr bit is a type of bit that comes in various cone shapes and can be used for sanding and grinding. You can get both things at a home improvement store or order them online.
• Use this method for deep gouges or chips that have sharp edges.
• You just want to remove the sharp edges of the gouge so the new gelcoat will blend in with the surrounding gelcoat better.

Warning : Wear safety glasses when operating a rotary tool so you don’t get any dust in your eyes.

• You can use this method for very thin scratches that don’t have sharp edges.

• If there is a lot of dust from sanding and grinding, you can also use a vacuum with a hose attachment to suck it up.

• If you are working in an area where the new gelcoat could drip down, then mask off the area below it with tape as well to protect it. You can tape plastic sheets over large areas to protect them.

Applying and Finishing New Gelcoat

• Gelcoat repair kits are available at marine supply shops, home improvement centers, paint supply stores, and online. A marine supply shop may be able to provide you with an exact match for your model and color of boat if it is a current model.
• Wax gelcoat is the best option to repair gelcoat because it will cure in the air without any additional components needed.

• Wear gloves, safety glasses, and a face mask when you mix the gelcoat.
• If your gelcoat repair kit doesn’t come with a mixing stick, then use a clean craft stick (like a wooden popsicle stick) to mix the gelcoat.
• Different gelcoat repair kits require you to add different amounts of hardener, also known as catalyst, to the gelcoat mixture so that it cures properly. Make sure you use the exact ratios or your gelcoat will either dry too quickly or won’t cure all the way.

Warning : Make sure you mix enough of the gelcoat to repair the entire damaged area at once. If not, it may not all cure at the same rate.

• If you are repairing an area where you sanded out light scratches, then just rub an approximately 1 ⁄ 32  in (0.079 cm) layer of the putty over the sanded area with the mixing stick.
• You will have about 10-15 minutes to work before the gelcoat starts to harden.

• Touch the gelcoat to make sure it is hard before you proceed to sand it. If it still feels sticky or tacky, then let it dry longer until it is hard.

• If the area still feels rough after you use 400-grit sandpaper, you can keep working your way up all the way to about 1000-grit sandpaper until you are happy with the smoothness.

• Remove the tape from around the repaired area before you begin buffing.
• Wipe away the haze from the rubbing compound with a clean cloth as you go.

• Once the wax has dried, after about 15 minutes in the sun, you can wash your whole boat and give the whole thing a second coat of wax so that the repaired area and the rest of the boat are equally shiny.

Expert Q&A

• Wear safety glasses when operating a rotary tool. Wear safety glasses, a face mask, and gloves when mixing gelcoat repair compound. Thanks Helpful 0 Not Helpful 0
• Mix enough gelcoat repair compound to repair the entire damaged area so it all cures at the same rate. Thanks Helpful 0 Not Helpful 0

Things You’ll Need

• Rotary tool
• Sandpaper of various grits
• Sanding block
• Safety glasses
• Painter’s tape
• Wax gelcoat repair kit
• Electric buffer
• Mixing stick
• Rubbing compound
• Clean cloths

You Might Also Like

• ↑ https://www.familyhandyman.com/automotive/how-to-repair-fiberglass/
• ↑ https://www.boatus.com/magazine/2017/december/easy-gelcoat-repairs.asp
• ↑ https://www.boatingmag.com/how-to-repair-damaged-gelcoat/

About This Article

• Send fan mail to authors

Did this article help you?

Featured Articles

Trending Articles

Watch Articles

• Terms of Use
• Privacy Policy
• Do Not Sell or Share My Info
• Not Selling Info

Don’t miss out! Sign up for

wikiHow’s newsletter

• New Sailboats
• Sailboats 21-30ft
• Sailboats 31-35ft
• Sailboats 36-40ft
• Sailboats Over 40ft
• Sailboats Under 21feet
• used_sailboats
• Apps and Computer Programs
• Communications
• Fishfinders
• Handheld Electronics
• Plotters MFDS Rradar
• Wind, Speed & Depth Instruments
• Anchoring Mooring
• Running Rigging
• Sails Canvas
• Standing Rigging
• Diesel Engines
• Off Grid Energy
• Cleaning Waxing
• DIY Projects
• Repair, Tools & Materials
• Spare Parts
• Tools & Gadgets
• Cabin Comfort
• Ventilation
• Footwear Apparel
• Foul Weather Gear
• Mailport & PS Advisor
• Inside Practical Sailor Blog
• Activate My Web Access
• Reset Password
• Customer Service

• Free Newsletter

Mason 33 Used Boat Review

Beneteau 311, Catalina 310 and Hunter 326 Used Boat Comparison

Maine Cat 41 Used Boat Review

Cheoy Lee Clipper 36 & 42 Used Boat Review

Tips From A First “Sail” on the ICW

Tillerpilot Tips and Safety Cautions

Best Crimpers and Strippers for Fixing Marine Electrical Connectors

Thinking Through a Solar Power Installation

Stopping Mainsheet Twist

Working with High-Tech Ropes

Getting a Clue for the Blown-Out Clew

Monel Seizing Wire is Worth the Extra Cost

Fuel Lift Pump: Easy DIY Diesel Fuel System Diagnostic and Repair

Ensuring Safe Shorepower

Sinking? Check Your Stuffing Box

The Rain Catcher’s Guide

Boat Maintenance for the Technically Illiterate: Part 1

Whats the Best Way to Restore Clear Plastic Windows?

Mastering Precision Drilling: How to Use Drill Guides

Giving Bugs the Big Goodbye

Galley Gadgets for the Cruising Sailor

Those Extras you Don’t Need But Love to Have

UV Clothing: Is It Worth the Hype?

Preparing Yourself for Solo Sailing

How to Select Crew for a Passage or Delivery

Preparing A Boat to Sail Solo

On Watch: This 60-Year-Old Hinckley Pilot 35 is Also a Working…

On Watch: America’s Cup

On Watch: All Eyes on Europe Sail Racing

Dear Readers

Chafe Protection for Dock Lines

• Boat Maintenance

Repairing Worn Gelcoat

Get ready to roll up your sleeves, or bust out your wallet..

Photos by Frank Lanier

Regarding your blog post on restoring gelcoat (posted online March 18, 2014 ): Ive seen many similar articles over the years directed toward refinishing topsides. However, Ive seen no discussion about restoring decks. I have an 18-year-old boat, and Im beginning to see pinholes in the deck gelcoat, particularly on edges and curves where I suspect the gelcoat is thinner. Im curious what the experts would recommend.

Is there an option to fill pinholes and compound over? Repainting is an option, but a very expensive one. On my previous 36-foot ketch, I was quoted $32,000 for a professional deck repainting (including all hardware removal and re-bedding). Repainting a deck must be the most expensive project on a boat-far more than a new engine-and the deck takes more wear and is the one place every owner sees, unlike the topsides.

Holt Bradshaw Via www.practical-sailor.com

Simply put, repairing deteriorated gelcoat on deck is either a major open-your-wallet or roll-up-your sleeves commitment. For an economical, wholesale refinishing project, we recommend paint over re-gelcoating. Even a paint project like yours can be a major undertaking. Removing and re-bedding all the hardware can double the labor time or cost due to headliners hiding fasteners, embedded aluminum backing plates, core damage needing repair, and other fun surprises.

If estimates for having the deck professionally repainted are too much your budget, consider a do-it-yourself job. Repainting the deck is an affordable, do-able DIY project for the handy boat owner, but its not a fast or easy task-especially if you have stubborn nonskid to remove before repainting. The large horizontal areas of nonskid are quite easy to prep, epoxy prime, and coat, but the glossy vertical surfaces are a challenge. Some do-it-yourselfers have a deft enough hand to paint these areas using the roll-and-tip method, a few learn to handle a spray gun (while donning a respirator, gloves, goggles and coveralls), but most compromise by taping off hardware rather than removing it and having a professional shoot the glossy surfaces, after which the owner tackles the nonskid. We recommend coating with either a two-part linear polyurethane (LPU) paint mixed with nonskid aggregate or an LPU paint pre-mixed with the additive. A third option is painting the deck but using an adhesive mat for the nonskid.

If youre considering a DIY deck project, be sure to check out our tests of nonskid paints and mats (see PS January 2012 and November 2013 online), and our three-year test of topside/deck paints, including LPUs (see PS December 2012 online) to find out which products best suit your needs and budget. For more detailed guidance on how to carry out your deck rehab, read DIY Topside Paint Test online (PS August 2009 ). The article details our adventures in DIY boat painting, with a look at proper prep (the key to success) and roll-and-tip application, plus other techniques, tools, and tricks of the trade. We also recommend Don Caseys Sailboat Refinishing .

RELATED ARTICLES MORE FROM AUTHOR

Leave a reply cancel reply.

Log in to leave a comment

Latest Videos

The Perfect Family Sailboat! Hunter 27-2 – Boat Review

Pettit EZ-Poxy – How to Paint a Boat

The Boat From True Spirit – Sparkman & Stephens

Top 5 Boat Hacks – Boat Maintenance Tips and Tricks

Latest sailboat review.

• Privacy Policy
• Do Not Sell My Personal Information
• Online Account Activation
• Privacy Manager

Please verify you are a human

Access to this page has been denied because we believe you are using automation tools to browse the website.

This may happen as a result of the following:

• Javascript is disabled or blocked by an extension (ad blockers for example)
• Your browser does not support cookies

Please make sure that Javascript and cookies are enabled on your browser and that you are not blocking them from loading.

Reference ID: 9c90c31e-61a7-11ef-b69c-b5b8c8ccfe59

Powered by PerimeterX , Inc.

• Sports & Outdoors
• Boating & Sailing
• Maintenance Supplies
• Painting Supplies

Enjoy fast, free delivery, exclusive deals, and award-winning movies & TV shows with Prime Try Prime and start saving today with fast, free delivery

Amazon Prime includes:

Fast, FREE Delivery is available to Prime members. To join, select "Try Amazon Prime and start saving today with Fast, FREE Delivery" below the Add to Cart button.

• Cardmembers earn 5% Back at Amazon.com with a Prime Credit Card.
• Unlimited Free Two-Day Delivery
• Streaming of thousands of movies and TV shows with limited ads on Prime Video.
• A Kindle book to borrow for free each month - with no due dates
• Listen to over 2 million songs and hundreds of playlists
• Unlimited photo storage with anywhere access

Important:  Your credit card will NOT be charged when you start your free trial or if you cancel during the trial period. If you're happy with Amazon Prime, do nothing. At the end of the free trial, your membership will automatically upgrade to a monthly membership.

Return this item for free

We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.

• Go to your orders and start the return
• Select your preferred free shipping option
• Drop off and leave!

Image Unavailable

• To view this video download Flash Player

Marine Fiberglass Repair Kit for Boats, Gel Coat Repair Kit for Boats, Epoxy Filler for Fiberglass Boats Fix Holes, Chips and Deep Cracks, Gelcoat Repair kit for Fiberglass, Acrylic, Porcelain(White)

Purchase options and add-ons

• Marine Fiberglass Repair Kit: This all-in-one epoxy filler can fix fiberglass boat damage efficiently, repairing deep scratches, cracks, chips, and holes in the boat, jet ski, yacht, surfboards, and other water vehicles. Our fiberglass repair kit has super strong adhesion and perfectly achieves seamless repair of marine gel coat, giving the boat finish a new life.rine Fiberglass Repair Kit
• Strong Adhesion & Lasting: Our gel coat repair kit for boats provides super-strong adhesion, UV resistance, and waterproof protection, ensuring durable repairs that withstand harsh marine conditions without damaging fiberglass surfaces. The premium fiberglass boat repair kit is both safe for you and the environment.
• Wide Applications: Our gelcoat repair kit for boats can be applied to vertical surfaces and works perfectly on most hard surfaces, carbon fiber, aluminum, PVC, acrylic, and wood. The boat gel coat repair kit is only for use on boat parts above the waterline. Our boat gel coat repair kit is the ideal choice for diverse marine repair needs.
• Easy To Use: 1. Clean the area to be repaired. 2. Remove the lid, place the push rod at the end of the boat fiberglass repair kit, and squeeze out the A&B boat paint in a 1:1 ratio 3. Mix A & B with a stirring stick until the color is uniform. 4. Apply the marine paint to the damaged area and smooth the surface with a yellow scraper. 5. Wait more than 24 hours for the repair paste to cure. 6. Sand the repaired area with sandpaper until the surface is smooth.
• Satisfaction: We're so confident that you'll love our fiber glasses repair kit, if you don't like this surfboard repair kit and if you have any problem with our Boat fiberglass repair kit, contact us at any time for help.

Frequently bought together

Similar items that may deliver to you quickly

From the brand

At Mallbaola, we believe every boat deserves to sail in perfect condition. Founded by marine enthusiasts, we understand the unique challenges watercraft owners face. Our Marine Fiberglass Repair Kit provides an easy solution for repairing chips, gouges, scratches, and holes on various watercraft, from jet skis to yachts. Mallbaola ensures your vessel remains in top condition. Sail with confidence, sail with Mallbaola.

Product Description

Product information

Technical details.

Item Package Dimensions L x W x H	‎5.35 x 2.56 x 1.61 inches
Package Weight	‎0.12 Kilograms
Brand Name	‎Mallbaola
Warranty Description	‎‎1 year after sale
Model Name	‎Marine Fiberglass Repair Kit
Color	‎White
Material	‎‎gel coat repair kit for boats
Suggested Users	‎unisex-adult
Manufacturer	‎Mallbaola
Part Number	‎Marine Fiberglass Repair Kit
Included Components	‎1 x 100ml Gelcoat Repair Kit, 2 x Sandpaper, 1 x Gloves, 1 x Push Rod, 1 x Yellow Scraper, 1 x Stirring Stick, 1 x Packing Box

Additional Information

ASIN	B0D7S8DXC7
Customer Reviews	4.5 out of 5 stars
Best Sellers Rank	#7,226 in Sports & Outdoors ( ) #3 in #4 in
Date First Available	July 22, 2024

Fields with an asterisk * are required

: : : Enter the store name where you found this product : Please select province : to provide feedback. \n' + ' ' ); } function getThankYouDiv(thankMsg) { return ( ' \n' + '

' ); } function getLoadingGifDiv() { return '

Videos for this product

Click to play video

Customer Review: Convenient and cost friendly

Customer Review: The Ultimate Fiberglass Repair Kit!

Julie Patten

Customer Review: Before and after

Adore kyaza

Looking for specific info?

Customer reviews.

• 5 star 4 star 3 star 2 star 1 star 5 star 88% 0% 0% 0% 12% 88%
• 5 star 4 star 3 star 2 star 1 star 4 star 88% 0% 0% 0% 12% 0%
• 5 star 4 star 3 star 2 star 1 star 3 star 88% 0% 0% 0% 12% 0%
• 5 star 4 star 3 star 2 star 1 star 2 star 88% 0% 0% 0% 12% 0%
• 5 star 4 star 3 star 2 star 1 star 1 star 88% 0% 0% 0% 12% 12%

Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

Reviews with images

• Sort reviews by Top reviews Most recent Top reviews

Top reviews from the United States

There was a problem filtering reviews right now. please try again later..

• Amazon Newsletter
• About Amazon
• Accessibility
• Sustainability
• Press Center
• Investor Relations
• Amazon Devices
• Amazon Science
• Sell on Amazon
• Sell apps on Amazon
• Supply to Amazon
• Protect & Build Your Brand
• Become an Affiliate
• Become a Delivery Driver
• Start a Package Delivery Business
• Advertise Your Products
• Self-Publish with Us
• Become an Amazon Hub Partner
• › See More Ways to Make Money
• Amazon Visa
• Amazon Store Card
• Amazon Secured Card
• Amazon Business Card
• Shop with Points
• Credit Card Marketplace
• Reload Your Balance
• Amazon Currency Converter
• Your Account
• Your Orders
• Shipping Rates & Policies
• Amazon Prime
• Returns & Replacements
• Manage Your Content and Devices
• Recalls and Product Safety Alerts
• Registry & Gift List

• Conditions of Use
• Privacy Notice
• Consumer Health Data Privacy Disclosure
• Your Ads Privacy Choices

American Boat Works

Fiberglass boat repair - serving st. petersburg, fl., located in tarpon springs, fl. 727-942-4152, fiberglass boat repair - free estimates - insurance claims welcome.

 American Boat Works has been in the fiberglass boat repair business serving the St. Petersburg  area since 1982 Our company is successfully repairing fiberglass boats & custom fiberglass boat building for many St. Petersburg customers. American Boat Works is also known for using only the best products available. We do factory warranty work for most major fiberglass boat builders directly and through their St. Petersburg dealerships.

 quality work & customer satisfaction is the foundation of our success. we can handle your insurance claims from start to finish. serving saint petersburg and surrounding areas..

CALL - 727-942-4152 

FIBERGLASS COLLISION EXPERTS - BOATING ACCIDENT - STORM DAMAGE

Our fiberglass and gelcoat repair technicians are trained in new fiberglass boat construction and the reconstruction of fiberglass and composite structural damage. New and old world industry techniques are used by our fiberglass repair techs to insure professional and quality repairs. Vessel collision and restorations are what we do. Color matching your gelcoat repair or existing paint job is our specialty. American Boat Works has done factory warranty work for most major fiberglass boat builders directly and through their St. Petersburg dealerships.

Our repair system on Kawasaki Jet Skis, Bombardier SeaDoo, Yamaha Waverunner, Honda Aquatrax, PWC and fiberglass sport jet boats has evolved with the new products allowing us to always guarantee our work.  Serving St Petersburg and surrounding areas.

Hull and Body Shop

We have the Experience - We can handle it!

St Petersburg, Florida

  727-942-4152

At American Boat Works Fiberglass Boat Repair we handle insurance claims on fiberglass boat collisions for all major Insurance companies. We offer a $200 discount off our St. Petersburg customers deductible on fiberglass boat repair. We have handled many factory warranty fiberglass boat repairs for many boat builders. Fiberglass boat building and repair has evolved over the years, the use of modern adhesives in fiberglass boats has enabled fiberglass boat builders and the fiberglass boat repair shops to save time in fiberglass boat building and on fiberglass boat repair. A fiberglass boat that has had a collision is obvious why its broken, but it's our years of experience that lets us determine why there was stringer failure or why there are stress cracks along the strakes, allowing us to properly repair and guarantee the job. We will not perform a fiberglass boat repair that we can not guarantee! Serving St. Petersburg and surrounding areas.

727-942-4152

Email us a picture of your damaged boat for a Free Estimate

[email protected]

Serving st. petersburg, florida.

Thanks for your message! We’ll be in touch soon.

Serving Pinellas County and all of Florida

Tarpon Springs - Palm Harbor - Dunedin - Clearwater - St. Petersburg

  New Port Richey  - Ocala - Gainesville -  Largo -  Tampa  - Brandon - Lakeland

Hudson  - Apollo Beach - Ruskin  - Orlando  - Crystal River  - Spring Hill

  Wesley Chapel  - Zephyrhills - Lutz - Odessa - Dade City -  Oldsmar

  Sarasota -  Coral Gables - Fort Lauderdale - Key Biscayne - Naples  

  Palm Beach  - Pinecrest - Aventura - Panama City -   Boca Raton - Weston

Safety Harbor -  Steinhatchee -  Claremont -   Daytona -  Charlotte Harbor -  Destin

Inverness -  Key Largo -  Jupiter -  Key West -  Marathon -  Miami -  Stuart -  West Palm  

Winter Haven

Service Locator

• Angler Endorsement
• Boat Towing Coverage
• Mechanical Breakdown
• Insurance Requirements in Mexico
• Agreed Hull Value
• Actual Cash Value
• Liability Only
• Insurance Payment Options
• Claims Information
• Towing Service Agreement
• Membership Plans
• Boat Show Tickets
• BoatUS Boats For Sale
• Membership Payment Options
• Consumer Affairs
• Boat Documentation Requirements
• Installation Instructions
• Shipping & Handling Information
• Contact Boat Lettering
• End User Agreement
• Frequently Asked Questions
• Vessel Documentation
• BoatUS Foundation
• Government Affairs
• Powercruisers
• Buying & Selling Advice
• Maintenance
• Tow Vehicles
• Make & Create
• Makeovers & Refitting
• Accessories
• Electronics
• Skills, Tips, Tools
• Spring Preparation
• Winterization
• Boaters’ Rights
• Environment & Clean Water
• Boat Safety
• Navigational Hazards
• Personal Safety
• Batteries & Onboard Power
• Motors, Engines, Propulsion
• Books & Movies
• Cockpit Confessions
• Communication & Etiquette
• Contests & Sweepstakes
• Colleges & Tech Schools
• Food, Drink, Entertainment
• New To Boating
• Travel & Destinations
• Watersports
• Anchors & Anchoring
• Boat Handling

How to Restore Gelcoat on a Boat

Advertisement

The outer surface of a fiberglass boat is normally a special resin called gelcoat. Gelcoat has little structural value — the underlying laminates of resin-saturated glass fabric provide that — but gelcoat protects the hull and gives it its color and shine.

When the gelcoat was originally sprayed into the hull mold, it — like all gels — took on the shape and texture of the mold surface. The ultra high gloss most new boats exhibit is due entirely to the highly polished, mirror-like surface of the mold used in the original construction of the boat.

Time and exposure eventually erode the relatively soft surface of gelcoat, leaving it dull and chalky. Fortunately, the gloss usually can be restored.

How To Clean Fiberglass

The first step in restoring the gloss to dull gelcoat is always a thorough cleaning. Add a cup of detergent to a gallon of water — warm water is better — and use a sponge to wash the surface with this solution. Be sure to protect your hands with rubber gloves.

If mildew is present, add a cup of household bleach to your cleaning solution. Difficult stains like fish blood and waterline scum may require the direct application of a concentrated cleaner formulated for fiberglass. Rinse the clean surface thoroughly and let it dry.

How To Degrease Gelcoat

For dependable results from wax or polish, the gelcoat surface must be completely free of oil and grease. Detergents often fail to fully remove these contaminants from porous gelcoat. Wipe the entire surface with a rag soaked in MEK (preferred) or acetone, turning the rag often and replacing it when you run out of clean areas. Again, protect your skin with thick rubber gloves.

How To Wax A Boat

Keeping gelcoat coated with wax-starting when the boat is new — is the best way to prolong its life. Regularly waxed gelcoat can retain its gloss for 15 years or more. The real purpose of a coat of wax is to protect, but wax also has restorative properties if the gelcoat is not too badly weathered.

Application instructions vary among brands, but in general you apply the wax with a cloth or foam pad using a circular motion. Let the wax dry to a haze, then buff away the excess with a soft cloth, such as an old bath towel. The remaining wax fills microscopic pitting in the gelcoat and provides a new, smooth, reflective surface.

How To Buff A Boat

Polish is not a coating, but rather an abrasive — like extremely fine sandpaper. Polishing removes the pitted surface rather than coating it. Use a soft cloth to apply polish to a small area at a time, rubbing with a circular motion until the surface becomes glassy. After polishing, you should apply a coat of wax to protect the surface and improve the gloss. Some polish products include wax in their formulations.

Using Rubbing Compound

If the gelcoat is weathered so badly that polish fails to restore its shine, you will need the stronger abrasives rubbing compound contains. Wax on the surface can cause the compound to cut unevenly, so first remove all wax by "sweeping" the surface in one direction — not back and forth — with rags saturated with dewax solvent or toluene.

Select a rubbing compound formulated for fiberglass and use it exactly like polish, rubbing it with a circular motion until the surface turns glassy. The gelcoat on your boat is about 10 times as thick as the paint on your car, so compound shouldn't cut all the way through it as long as you are careful not to rub in one place too long. If the gelcoat starts to look transparent, stop.

After the surface has been compounded, polish it, then coat it with wax and buff it. Providing the gelcoat has an adequate thickness — your boat might have been compounded previously — this process will restore the shine to fiberglass in almost any condition.

Do You Need an Electric Buffer?

You can wax, polish, and compound by hand, but on anything but the smallest boat, your arm is going to get very tired. An electric buffer takes much of the work out of keeping a boat shining and is less expensive and less painful than elbow replacement.

Electric buffers operate at relatively slow speeds, so don't try to "make do" with a polishing bonnet fitted to a disk sander or a sanding pad chucked into a drill. You will either ruin the surface or ruin the tool. A buffer with an orbital motion will leave fewer swirl marks.

Should I Use Gelcoat Restorer?

In recent years a number of products have come on the market that claim to restore the surface of the gelcoat. Restorer formulations renew the gloss in essentially the same way as wax — by providing a new smooth surface — but without the need for buffing. Results can be dramatic, but because restorers are a plastic (acrylic) coating — similar to urethane varnish — they can wear off, flake off, and occasionally discolor. Restorer kits typically include a prep wash and sometimes a polish in addition to the restorer. A specialized stripper for removing old sealer is also necessary.

There are variations in the recommended application, but in general it is the same as already described — clean, polish, and coat. The acrylic sealer is usually water-thin, so applying it to the hull is much easier than, say, paste wax. And it dries to hard film, so no buffing is needed. However you do have to apply several coats — five is typical — to get a good shine. If the product you have selected doesn't include an applicator, use a sponge or a soft cloth to wipe the sealer onto the gelcoat. Drying times are short, so subsequent coats can generally be applied almost immediately.

A multicoat application can restore the shine to weathered gelcoat for up to a year, but when it is time to renew it, you will need to remove the old sealer using the special stripper supplied in the kit (or available separately). Apply five fresh coats of sealer and your boat should shine for another year.

BoatUS Members save at Boat Shows

Make sure to mark your calendars for two exciting events! BoatUS Members save 25% with code BOAT24US.

Related Articles

The truth about ceramic coatings for boats.

Our editor investigates the marketing claims of consumer-grade ceramic coatings.

Fine-Tune Your Side Scan Fishfinder

Take your side-scanning fishfinder off auto mode, and you’ll be spotting your prey from afar in no time

DIY Boat Foam Decking

Closed-cell foam flooring helps make boating more comfortable. Here’s how to install it on your vessel

Click to explore related articles

Contributor, BoatUS Magazine

Don Casey has been one of the most consulted experts on boat care and upgrades for 30 years, and is one of the BoatUS Magazine's panel of experts. He and his wife cruise aboard their 30-footer part of the year in the eastern Caribbean. His books include Don Casey's Complete Illustrated Sailboat Maintenance Manual, and the recently updated This Old Boat, the bible for do-it-yourself boaters.

BoatUS Magazine Is A Benefit Of BoatUS Membership

Membership Benefits Include:

Subscription to the print version of BoatUS Magazine

4% back on purchases from West Marine stores or online at WestMarine.com

Discounts on fuel, transient slips, repairs and more at over 1,200 businesses

Deals on cruises, charters, car rentals, hotel stays and more…

All for only $25/year!

We use cookies to enhance your visit to our website and to improve your experience. By continuing to use our website, you’re agreeing to our cookie policy.