Maya Ellison
The outer surface of a fibreglass boat is typically made from a special resin called gelcoat, which protects the hull and gives it its colour and shine. Over time, the gelcoat can become dull and chalky, but it can be refurbished. This can be done by hand with wax, polish, and compound, but for larger boats, an electric buffer is recommended. Alternatively, restorer formulations can be used to renew the gloss without the need for buffing, but these can wear off, flake off, and occasionally discolour. For plastic boats, repairs can be made using epoxy and lightweight fibreglass fabric. The plastic surface can be prepared for bonding using a flame treatment, and the repair process involves cutting and layering fibreglass patches.
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What You'll Learn
Cleaning the plastic boat skin
Firstly, identify the type of plastic your boat is made of. Common types include ABS, thermoplastic, and polyethylene. Knowing the type of plastic will help you choose the most suitable cleaning products and methods.
For a basic clean, start by rinsing the plastic surface with fresh water to remove any loose dirt, dust, or debris. This step is crucial to prevent scratches caused by rubbing dirt particles into the plastic. Use a gentle stream of water and avoid high-pressure hoses, as they can damage the plastic.
Next, prepare a mixture of mild soap and water. Avoid using detergents, as they may contain chemicals that react with the plastic. Instead, opt for a non-detergent, mild, non-reactive soap. Soak a soft, clean cloth in the soapy water and gently wipe down the plastic surface. Work in small sections, rinsing and wringing out the cloth frequently to avoid spreading dirt around.
For more intensive cleaning, you may need to use specialised products. For example, if your boat has yellow markings and scratches, you will need to polish the plastic. Remove the plastic components, such as windows, and lay them on a flat surface. Apply a fine-grit polishing compound with a clean cloth, and use an electric polisher with a polishing pad to work the compound into the plastic gently. Remember to keep the polisher at a low speed to avoid melting the plastic.
Finally, always perform a patch test in an inconspicuous area when trying a new product to ensure it does not damage or discolour the plastic. Rinse and dry the surface thoroughly after cleaning to remove any residual cleaning agents.
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Removing hard water spots and algae scum
Firstly, it is important to understand the factors that influence the cleaning process. The frequency of boat usage plays a crucial role. If you use your boat frequently, especially in areas with high scum buildup, regular cleaning is necessary. Additionally, environmental conditions impact scum accumulation. Lakes with high algae content or heavy vegetation may require more frequent cleaning. Seasonal changes also affect scum buildup, with warmer months leading to increased algae development and potentially needing more frequent cleaning.
Now, let's discuss the actual cleaning process. For hard water spots, a mixture of vinegar and water can be effective. Apply this solution generously to the affected areas and let it sit for 15-20 hours. You can then use your thumbnails or a plastic tool to scrape away the loosened hard water spots. For more severe hard water scale, a solution of three parts water and one part pool acid can be sprayed onto the affected areas. Always test this solution on a small area first to ensure it doesn't damage the surface.
When dealing with algae scum, you can use a mild detergent mixed with warm water. Gently scrub the affected areas with a soft sponge or brush. There are also specialised boat cleaners available, such as Star Brite Boat Cleaner and Meguiar's Marine/RV All-Purpose Cleaner, which are designed to tackle algae, scum, and other organic buildup on boat surfaces. These cleaners often contain ingredients that can effectively break down and dissolve tough residues.
If you prefer an eco-friendly approach, biodegradable and ecologically safe cleansers are available. These products are designed to minimise environmental impact while still effectively removing algae, scum, and organic matter. Be sure to read reviews and seek recommendations from other boat owners to find the most suitable eco-friendly cleaner for your needs.
Finally, don't forget to protect your skin and hands during the cleaning process. Wear thick rubber gloves and consider using a soft cloth or sponge to prevent scratching or damaging the boat's surface. By following these instructions, you can effectively remove hard water spots and algae scum from your plastic boat skin, restoring its pristine appearance.
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Repairing plastic boat skin
The outer surface of a fibreglass boat is typically made from a special resin called gelcoat. Gelcoat has little structural value but protects the hull and gives it its colour and shine. Over time, the surface of the gelcoat can become dull and chalky. However, there are several ways to repair and restore it.
Cleaning and Scrubbing
First, you need to clean the surface of the boat. This can be done with a hose-down, followed by soap and water scrubbing. The stiffness of the brush bristles should correspond to the age of the gelcoat, with soft bristles for new boats and stiffer brushes for older boats. You can also try using white vinegar on a cotton cloth to remove stubborn stains. If that doesn't work, try Windex or Simple Green before moving on to a fine mesh scrub pad, acetone, or another solvent. It is important to avoid using harsh chemicals or damaging the outer surface of the gelcoat.
Waxing and Polishing
Once the surface is clean, you can apply a paste wax or liquid polish to create a protective layer. These products contain wax and other chemicals that bond to the surface, making it less porous and less susceptible to staining. You can also use a high-carnauba-content paste wax, which requires more buffing but delivers an admirable shine. An electric buffer can be helpful for this process, as it is less tiring and less expensive than hand buffing. It is important to avoid using wax-cutting detergents and to regularly hose down the boat with freshwater to reduce the need for scrubbing.
Gelcoat Repair Kits
If the gelcoat is damaged, you can use a gelcoat repair kit to fix it. First, sand the perimeter of the ding with 220-grit sandpaper, dust it off, and wipe it with acetone. Then, mix the colouring agents in the kit to match the shade of your boat. Cover the patch with a sheet of Mylar or plastic during the curing process to create an oxygen-free environment. Once the gelcoat has cured, you may need to do some wet sanding and feathering around the repair.
Flame Treating and Epoxy
For more extensive repairs, you may need to use a flame treatment and epoxy. Hold a propane torch flame about 4 to 6 inches from the plastic, moving it across the surface at a rate of 2 to 3 inches per second. This will burn off contaminants and produce surface oxidation, improving adhesion. Apply a coat of clear epoxy within 30 minutes to an hour of the flame treatment. Cut and layer fiberglass patches, making sure each layer is staggered in size.
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Waxing and polishing the gelcoat
Before waxing and polishing, it is essential to thoroughly clean the boat to prevent dirt from getting further into the pores of the gelcoat. This can be done using diluted oxalic acid or a marine oxalic acid-based gel coat cleaner product to remove yellowing, rust marks, and stains. If mildew is present, add a cup of household bleach to a boat cleaning solution and wash down. Rinse the surface and let it dry.
The next step is polishing, which creates a smooth, glossy surface. Polishing can be done by hand or with a variable-speed polisher and a rubbing compound. If done by hand, use a circular motion, allowing one section at a time to dry and hazing over to about 80-90% before buffing off with a microfibre cloth.
The final step is waxing, which involves applying a thin polymer or natural wax coating to seal and protect the polished gelcoat. Waxing can also be done by hand or with a polisher, using a circular motion. Allow the wax to dry and haze, then buff away the excess with a soft cloth. Waxing should be done twice a year to maintain the gel coat in excellent shape.
It is important to note that while waxing and polishing can enhance the appearance of a boat, keeping the boat clean and maintaining it regularly are also crucial for protecting the gelcoat and preserving its value.
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Using a buffer or polisher
Before using a buffer or polisher, it is important to clean the boat thoroughly. Hose the boat with clean, warm water to remove any dirt and grime. Next, divide the boat into sections and apply an all-purpose cleaning solution or detergent to each section, scrubbing with a microfibre cloth or soft-bristled brush. Rinse the boat with water and dry it with a microfibre cloth.
When using a buffer or polisher, it is important to work in small sections, less than a square meter in size. Apply a small amount of polishing compound onto a clean foam or microfiber pad. Use an applicator pad for controlled application. Spread the compound evenly over the surface, applying light to medium pressure and working in a back-and-forth or circular motion.
Use a rotary buffer or dual-action polisher to buff the compound into the surface. Keep the electric buffer moving at a moderate speed and maintain even pressure. Overlap each pass by about 50% to avoid uneven results. Periodically stop and check your progress, adjusting the pressure, pad, or compound as needed.
After completing a section, use a clean microfiber cloth to wipe off excess compound before it dries. Repeat this process for the entire boat, and if any sections look like they need more than one coating, feel free to apply an additional layer. You can also use a fine polish after the heavy polish to address minor scratches and damage.
Finally, apply boat wax using a foam pad onto the sections using circular motions. Apply the wax in small areas to avoid drying. Once you’ve applied the wax, leave it to air dry for a few minutes. Check after 5-10 minutes; the wax should have a dull glaze.
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Frequently asked questions
The outer surface of a fibreglass boat is a special resin called gelcoat. To refurbish this, you must first flush away loose debris with a hose, then scrub with soap and water. Next, sand the damaged area with 220-grit sandpaper, dust, and wipe with acetone. Apply a gelcoat-repair kit, covering the patch with Mylar or plastic during the curing process. Finally, wet sand and feather the gelcoat once it has cured.
To protect the plastic skin of your boat, you should regularly wax the gelcoat. This can be done by hand or with an electric buffer. First, ensure the surface is free of oil and grease by wiping it with a rag soaked in MEK or acetone. Then, apply wax with a cloth or foam pad in a circular motion. Finally, buff away the excess wax with a soft cloth.
To repair the plastic skin of your boat, you can use a flame treatment to burn off contaminants and weak boundary layers. Hold a propane torch flame 4 to 6 inches from the plastic and move it across the surface at a rate of 2 to 3 inches per second. Then, apply a coat of clear epoxy within 30 minutes of treatment. Cut and layer fiberglass patches, ensuring that each layer is staggered in size.
