Andrew Pace
Fiberglass boats are popular among boat enthusiasts due to their durability, lightweight build, and cost-effectiveness. However, with time, they may require restoration due to prolonged exposure to elements like sunlight and saltwater, which can cause degradation, resulting in a worn and faded appearance. One common issue is gel coat deterioration, where the protective layer on the fiberglass boat fades, becomes chalky, or develops hairline cracks. To restore the boat's aesthetic appeal and maintain its structural integrity, owners may need to repair or reseal the cap. This process involves fixing scuffs, dents, and scratches and deep structural issues, which can be done using a variety of methods and materials, such as polyester or epoxy resins, gel coats, and fiberglass fabric.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Materials | Glass fabric, resin, gel coat, buffer, disposable spray gun, acetone, rags, paper cups, stir sticks, glass cloth, gel coat reducer, laminate, fiberglass fabric, mat, cloth, vinylester resin, epoxy, polyester resin |
| Tools | Bristle brush, foam brush, tight-knap foam roller, 1,000- to 1,200-grit wet-dry sandpaper, 600-grit sandpaper, 800-grit sandpaper, professional buffer, plastic screwdriver handle, digital and mechanical thermometers, 3 ml. syringes, cc cups |
| Techniques | Sanding, buffing, taping, polishing, wet-sanding, spraying |
| Time | 2-3 hours touch-cure time, 7 days for a full cure |
| Cost | A few hundred dollars for materials and a buffer |
| Prevention | Keep the boat away from prolonged exposure to sunlight, saltwater, and wear |
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What You'll Learn
Repairing scratches and scuffs
To repair scratches and scuffs on a fibreglass boat, you will need to address the gel coat, which is the thin layer of pigmented resin that gives the boat its sheen and colour. Most light scratches are in the gel coat layer and can be sanded out and built back up with a new gel coat. However, if the scratches penetrate the core, they will need to be filled with "chop" (powdered fibreglass) filler, gel coat and gel coat reducer.
Firstly, identify the type of scratch you are dealing with. Surface-level scratches can be repaired by buffing out the gel coat with a polishing compound like PolyShine. For deeper scratches that penetrate the gel coat, you will need to fill in the area with a gel coat paste. BoatUS.com recommends using a plastic spreader to apply an even level of gel coat paste and then scraping away the excess. It is important to prepare the area by opening up the scratch into a V-shape using the corner of a scraper.
Before applying the gel coat, make sure to mix it with the hardener and reducer according to the manufacturer's recommended ratio. You can use paper cups to mix the gel coat and a disposable spray gun to apply it. Spray the patched areas with short bursts, feathering the spray along the edges to reduce sanding. Remember that spraying gel coat is not like spraying paint; it will need to be sanded and buffed to achieve a smooth gloss.
After applying the gel coat, wait for it to cure. Then, use sandpaper to sand the repairs, starting with 600-grit and then moving to 800-grit. For the perfect finish, use 1,200-grit wet/dry paper and then buff the area. Apply the buffing compound directly to the pad on your buffer, using light to medium pressure at a fairly low speed. Remember to wipe off the haze as you go.
To maintain the "like-new" look of your boat, it is recommended to use a Fiberglass Rubbing Compound for cleaning. This will help minimise the loss of the gel coat surface and keep the fibreglass structure strong. Additionally, consider using a product like KBS DiamondFinish Clear to restore the gloss to your boat's gel coat.
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Using the right tools
For repairs, you will need a range of tools, including a plastic screwdriver, a sharpie, digital and mechanical thermometers, syringes, cups, rags, and acetone. These tools will help you measure, mix, and apply the resin accurately. Additionally, you may require a disposable spray gun, paper cups, stir sticks, and a professional-grade buffer for a flawless finish.
When working with fiberglass, it is crucial to wear protective gear, such as gloves and a respirator, to safeguard yourself from the resin and fiberglass dust. Eye protection is also highly recommended to prevent any accidental splinters or debris from causing eye injuries.
For the resealing process itself, you will need a bristle brush, a foam brush, or a tight-knap foam roller. These tools will enable you to apply the sealant evenly and smoothly. It is recommended to avoid using a polyester knit or woven roller, as these can shed lint onto the surface.
Finally, for the curing and finishing stages, have some masking tape, sandpaper of varying grits (600, 800, 1000-1200), and a buffing compound ready. These will help you refine the finish, ensuring a smooth and glossy surface.
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Preparing the surface
Begin by inspecting the boat for any damage or degradation. This includes checking for gel coat deterioration, such as fading, chalkiness, or hairline cracks. These issues must be addressed to prevent them from becoming more severe. Look out for blister formation below the gel coat, which can occur due to osmotic reactions.
The next step is to gather the necessary tools and materials. You will need items such as sandpaper, a buffer, acetone, rags, and, if needed, glass fabric, resin, and a disposable spray gun. Having everything prepared and within reach will make the process more efficient.
If there are any deep scratches or gouges, you will need to fill them. Mix "chop" (powdered fiberglass) filler with gel coat and gel coat reducer to create a thick paste. Apply this mixture to the damaged areas, using a disposable spray gun for a smooth application. Allow the filler to cure before proceeding.
Once the filler has cured, it's time to sand the repairs. Start with 600-grit sandpaper, progressing to 800-grit, and finally, using 1,200-grit wet/dry sandpaper for the perfect finish. Sanding will smooth out the filler and create a uniform surface for the new seal.
After sanding, it's important to clean the surface thoroughly. Use acetone and rags to wipe down the area, removing any dust, residue, or contaminants. Ensure that the surface is completely dry before proceeding to the next step.
Finally, mask off the area around the repair to protect the surrounding surfaces. Use masking tape and cover any nearby fixtures or components. This will ensure that only the intended surface is prepared and sealed.
By following these steps, you will effectively prepare the surface of your fiberglass boat for resealing. This process will help ensure a strong bond, a smooth finish, and long-lasting protection for your boat.
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Applying the gel coat
Preparation:
Before applying the gel coat, it is essential to prepare the boat's surface. Start by washing the boat thoroughly with a pressurized spray hose and suitable boat cleaning products to remove any dirt or residue. Next, dry the boat completely using a clean microfiber cloth or chamois. Identify any cracks, scratches, or chips and mark them with masking tape or painter's tape. Cover and protect the areas that will not be worked on. Once the damaged areas are identified, give them an extra clean. Then, use medium-grit sandpaper to wet sand the cracks properly. This step is crucial to repairing the cracks and ensuring the gel coat adheres well.
Gel coats can be applied using a brush, roller, or sprayer. For the best cosmetic results and minimal sanding after curing, spraying the gel coat is recommended. If using a sprayer, a gel coat spray gun, such as the G-100 Gel Coat Cup gun, is ideal. Prepare the gel coat mixture by thinning it with a gel coat reducer to ensure it can be sprayed effectively. The amount of thinning required may vary depending on the specific product and application method. Always refer to the manufacturer's instructions.
When spraying, work in a well-ventilated area, and if possible, choose a shaded area to avoid extreme weather conditions that can affect the application and curing process. Maintain a consistent temperature between 60-90°F (15-32°C) during application, with an ideal range of 70-80°F (21-27°C). Apply the gel coat evenly to the prepared surfaces, ensuring a smooth and thorough coverage.
Curing and Sanding:
After applying the gel coat, allow it to cure. The curing time may vary depending on temperature and humidity levels, typically taking 2 to 3 hours for touch-curing. Once cured, use sandpaper to smooth out the repairs. Start with 600-grit, then move to 800-grit sandpaper. For a flawless finish, use 1,200-grit wet/dry sandpaper and then buff the surface.
Polishing:
To enhance the shine and protect the gel coat, polishing is essential. Apply a buffing compound directly to the pad of your buffer and work on a small area at a time, using light to medium pressure at a low speed. As the compound starts to dry, reduce the pressure. Wipe away any haze that forms during the process.
By following these steps and allowing adequate curing time, your fiberglass boat will have a durable and glossy gel coat finish that protects it from the elements and maintains its structural integrity.
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Polishing and buffing
Firstly, the boat should be cleaned with warm water and detergent to remove any dirt and grime. It should then be dried with a microfibre cloth. Next, the boat should be divided into small sections, and a heavy compound should be used for significant scratches, or an all-purpose polishing compound for minor wear and tear. A clean cloth or soft brush can be used to apply the polish in sections, and it should be sprayed with clean water.
An orbital buffer should then be used on its slowest setting with a wool buffing pad to make slow, horizontal passes over the polish. This process should be repeated until the polish is clear and shiny. It is important not to use the buffer on its fastest setting, as this could risk burning off the gel coat. Instead, the speed and pressure should be slowly increased. Once the buffering is complete, a clean rag or microfibre cloth can be used to wipe away any excess polishing compound.
Buffing compound can be applied directly to the pad of the buffer and worked on in a 2x2 ft area with light to medium pressure at a low speed. As the compound dries, the pressure should be reduced, and any haze wiped away. If the gel coat is very weathered, a stronger abrasive like a rubbing compound may be needed. Wax can be applied on top of the polish to further improve the gloss and protect the surface.
Regular waxing and polishing of a fibreglass boat will help to prolong its glossy look.
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