Gelcoat is a specialized coating that is applied to fiberglass boats to protect them from the elements. It can suffer damage over time, however, and may need to be repaired. There are gelcoat repair kits available that make the process relatively easy. These kits usually contain a sealant, sandpaper, and a putty knife, among other things.
The first step is to clean the surface of the boat with a solvent such as acetone. Then, the damaged area should be sanded down until it is smooth. The sealant should be applied next, and then the putty knife should be used to smooth it out. Finally, the area should be allowed to dry completely before being painted or varnished.
How much to paint and gelcoat a boat?
The cost of painting or gelcoating a boat depends on several factors, including size, condition, and whether you tackle it yourself or hire a professional.
DIY Costs
- Gelcoat Repair Kits: Small repairs start around 50–50–200 for a quality kit.
- Marine Paint: A gallon of topside paint runs 60–60–200, plus primer and supplies.
- Tools & Materials: Sandpaper, rollers, and masking tape add another 100–100–300.
Total DIY cost for a full refresh? 500–500–1,500 for a mid-sized boat.
Professional Costs
- Gelcoat Restoration: Expect 2,000–2,000–10,000+, depending on hull size and damage.
- Full Repaint: A professional marine paint job ranges 3,000–3,000–15,000 (higher for yachts).
- Additional Work: If fiberglass repairs are needed, costs climb quickly.
What Affects the Price?
- Boat Size – More surface area = higher labor and material costs.
- Prep Work – Sanding, filling, and masking take time.
- Paint/Gelcoat Quality – Premium marine-grade products cost more but last longer.
Bottom Line: DIY saves money but requires skill. For flawless, long-lasting results, professionals are worth the investment—especially for larger boats.
Will acetone damage gelcoat?
Acetone is a powerful solvent commonly used in boat maintenance, but many owners worry—will it harm gelcoat? The short answer is no, if used correctly. However, improper use can cause issues. Here’s what you need to know.
Safe Use of Acetone on Gelcoat
Acetone is an effective cleaner for removing wax, grease, and contaminants before repairs. When used properly, it won’t dissolve or weaken gelcoat. Key tips:
✔ Test First – Apply a small amount on an inconspicuous area.
✔ Use Sparingly – Dampen a lint-free cloth, don’t pour directly.
✔ Wipe Gently – Avoid scrubbing aggressively to prevent dulling.
✔ Ventilate – Fumes are strong; work in open air.
When Acetone Can Cause Problems
While acetone is generally safe, misuse can lead to:
- Temporary Dulling – Over-saturation or harsh wiping may reduce shine (fixable with polishing).
- Dryness – Frequent use without rewaxing can dry out gelcoat over time.
- Stripped Wax – Acetone removes protective coatings, so reapply wax after cleaning.
Alternatives to Acetone
For those hesitant to use acetone:
- Isopropyl Alcohol (70%) – Milder but less effective on tough grime.
- Marine Cleaners – Products like 3M Marine Cleaner & Wax Remover are gelcoat-safe.
Final Verdict– Acetone is a safe, effective cleaner for gelcoat when used with care. It’s essential for proper adhesion in repairs, but always follow up with wax to restore protection.
Pro Tip: Never let acetone pool on surfaces—always wipe dry immediately. When in doubt, spot-test first!
Can you paint over gelcoat?
Yes, you can paint over gelcoat, but proper preparation is crucial for long-lasting results. Gelcoat’s smooth, non-porous surface makes adhesion challenging, so skipping prep steps will likely lead to peeling or blistering. Here’s how to do it right:
Key Preparation Steps
- Clean Thoroughly – Wash with soap/water, then wipe with acetone to remove wax and contaminants
- Sand the Surface – Use 220-320 grit sandpaper to create “tooth” for paint adhesion
- Repair Damage – Fill cracks/chips with marine filler before sanding smooth
- Apply Primer – Use a marine-grade epoxy primer (like Interlux 2000E) for best bonding
Best Paint Options
- Two-Part Polyurethanes (Awlgrip, Alexseal) – Most durable for hulls
- Acrylic Enamels (Pettit Easypoxy) – Easier application for DIYers
- Single-Part Polyurethanes – Good compromise for topsides
Application Tips
- Work in 70-85°F temperatures with low humidity
- Apply thin coats (2-3 minimum) with proper drying time between
- Use high-quality brushes/rollers or HVLP spray equipment
- Finish with marine wax after full cure (typically 30 days)
When to Consider Gelcoat Instead
While painting works, reapplying gelcoat may be better if:
- You want maximum UV protection
- The existing gelcoat just needs restoration (wet sanding/buffing)
- You’re matching original factory colors
Pro Tip: For areas below the waterline, use specialized antifouling paint instead of standard marine paint. Always check manufacturer instructions for your specific products. With proper prep and quality materials, painted gelcoat can last 5-10 years before needing refreshment.
What grit sandpaper for gelcoat?
When it comes to boat repair, there are a few key items you need to have in your arsenal. Sandpaper is one of those items. Grit sandpaper is what you’ll need for gelcoat repair. The higher the grit number, the finer the sandpaper. You’ll want to start with a low grit number like 200 and work your way up to a higher number like 600. This will help you achieve a smooth finish.
How many coats of gelcoat?
There is no one definitive answer to the question of how many coats of gelcoat to apply on a boat. The number of coats you need may vary depending on the condition of the substrate, the quality of the gelcoat, and your own personal preferences.
If the surface is in good condition with no damage or oxidation, then a single coat may be all that is necessary. If there is any damage or oxidation present, then two coats should be applied for optimal coverage and protection.
In general, a good rule of thumb is to apply at least two coats, with each coat being applied evenly and thoroughly. Some people prefer to add a third coat for an even thicker finish. Make sure to allow adequate time between coats for the previous coat to dry completely before applying the next one.
Can you gelcoat over bondo?
The answer is yes, you can, but there are a few things you need to keep in mind. First of all, you need to make sure that the surface is sanded smooth and that there are no bumps or protrusions. You also need to make sure that the surface is clean and free of any dust or debris. If the surface is not properly prepared, the gelcoat will not adhere correctly and it may peel away.
Another thing to keep in mind is that bondo is a porous material and it will absorb the gelcoat. This means that the gelcoat will not be as durable as it would be if it were applied over a solid surface.
Can you use car rubbing compound on a boat?
In general, car rubbing compound is a great choice for boats. It can remove oxidation and other blemishes, and it will leave your boat with a shiny finish. However, it’s important to make sure that you use the right kind of car rubbing compound.
Some compounds are designed for use on cars only, and they may not be suitable for boats. Be sure to read the label carefully before purchasing any product. If you’re not sure which product to choose, ask an expert at your local boat dealership or marina.
Does gelcoat stick to epoxy?
The short answer is: yes, gelcoat sticks to epoxy. The long answer is: it depends.
Epoxy has a tendency to be brittle and can crack when struck or flexed. Gelcoat is less brittle and more flexible, so it can help protect the epoxy from cracking. However, if there are any defects in the epoxy layer, the gelcoat can peel away from those areas.
In general, if the epoxy is applied well and there are no defects, the gelcoat should stick to it without any problems.
What is the best gelcoat and gelcoat repair kit?
When it comes to repairing gelcoat damage on a boat, there are a few things you need to consider. The first is the type of gelcoat that is on your boat. There are different types of gelcoat, and each has its own strengths and weaknesses. The best type of gelcoat to use for repairing damage is one that is designed for marine use. Marine-grade gelcoat is made to withstand the harsh conditions that exist in salt water environments. It is also formulated to resist fading and chalking in sunlight.
If you are not sure what type of gelcoat your boat has, you can check the manufacturer’s website or contact them directly. Once you have determined the type of gelcoat that is on your boat, you can then begin looking for a repair kit that is specifically designed for that type of gelcoat.
Where to buy gelcoat and gelcoat repair kit?
Are you in the market for a gelcoat repair kit? If so, you may be wondering where to buy one. A few locations to check out are listed below:
- Local marine supply stores: Marine supply stores typically carry a wide variety of boat-related supplies, including gelcoat repair kits. This is a great place to start if you’re looking for a local option.
- Online retailers: There are a number of online retailers like eBay or Amazon that sell gelcoat repair kits. This is a great option if you’re looking for a wide selection or want to shop from the comfort of your own home.
- The manufacturer’s website: Many manufacturers of gelcoat repair kits also sell their products online. This can be a good option if you’re looking for specific instructions or have questions about the product.
How much does gelcoat and gelcoat repair kit cost?
The cost of a gelcoat repair kit will vary depending on the size of the kit, the brand, and where it is purchased. Generally, a kit will range in price from $10 to $50. Larger kits that include more products or a higher-quality brand may cost more. The kit will include a bottle of gelcoat, a brush, and instructions for use. It is important to choose a quality kit that will provide long-lasting results.
The cost of the gelcoat itself will also vary depending on the brand, color, and amount needed for the job. A gallon of gelcoat can range in price from $60 to $200.
Conclusion
Gelcoat is a durable and attractive material that can be used for a variety of applications. A gelcoat repair kit is an easy way to fix any damage that may occur, and it is a relatively affordable option. Anyone who is interested in using gelcoat for a project should consider purchasing a kit to have on hand in case of accidents or wear and tear.
Photo: amazon.com
