Andrew Pace
Fiberglass boats are renowned for their durability and lightweight build, but they are not impervious to the test of time and the elements. Restoring an old fiberglass boat is a meticulous art that requires a lot of work and planning. There are several books available that can help with this process, such as Fiberglass Boat Restoration: The Project Planning Guide by Canning, Wayne, which provides valuable information about what to look for when considering the purchase of a project boat. Another book, This Old Boat, 2nd Edition, covers new sections on electrical systems, diesel engines, refrigeration, resins, and plumbing, and includes over 600 illustrations.
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What You'll Learn
Planning and organisation
Begin by thoroughly inspecting the boat to identify areas that require refurbishment. Look for signs of oxidation, such as a cloudy or chalky white finish, and check for cracking or crazing in the fibreglass around fixtures and fittings. Pay close attention to load-bearing structures and ensure they have proper backing plates. Old boats may also have rotting wood, so check the deck floor, seat bases, and especially the transom for sagging, rot, or decay.
Once you have assessed the boat's condition and determined the scope of work, create a detailed plan that outlines the steps you need to take. This plan should include a list of materials and tools required, as well as an estimated timeline for the project. It is important to be realistic about the time and resources needed, as refurbishment can be a time-consuming and challenging task.
Gather the necessary tools and materials before starting the refurbishment. This includes items such as boat brushes, stain removers, protective gear (such as gloves, coveralls, and eye protection), detergents, solvents, buffers or polishers, and sandpaper. It is also important to have a well-ventilated work area and to follow safety precautions when working with chemicals.
Depending on the extent of the refurbishment, you may need to set aside a significant amount of time and allocate a suitable budget. It is always a good idea to double your calculated cost or add a 10-20% buffer to account for unexpected expenses. Additionally, consider the size of the boat, as larger boats will typically cost more and take longer to restore.
Proper planning and organisation will help ensure a successful refurbishment project. By taking the time to assess, plan, and gather the necessary resources, you can bring new life to an old fibreglass boat.
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Cleaning and preparing the surface
To refurbish an old fibreglass boat, the first step is to clean and prepare the surface. This process involves several steps to ensure the surface is ready for further work.
Firstly, use a marine detergent to thoroughly clean the boat. This will remove dirt, grease, and other contaminants that have built up over time. It is important to choose a detergent that is suitable for fibreglass boats and will not damage the surface.
Next, if the boat has any paint or gel coat, it is important to remove this. The gel coat is a protective layer applied to the exterior of fibreglass boats to maintain their appearance and protect them from the elements. If it is damaged or aged, it will need to be removed using a chemical stripper or a mechanical sander. It is important to work in small sections to maintain control during this process. Once removed, the fibreglass will be ready for a new waxing and polishing treatment.
After removing the gel coat, the boat's surface will need to be sanded. Start with a coarse grit and gradually move to finer grits to ensure a smooth finish. This step will prepare the surface for any necessary repairs and create a uniform base for the new gel coat or paint.
Finally, inspect the boat for any blisters, cracks, holes, or delamination. For blisters, drain the fluid, dry the area, and fill it with an appropriate filler. Clean and fill cracks and holes with a fibreglass repair kit, ensuring that the repairs maintain the structural integrity of the boat. In the case of delamination, remove the affected section and replace it with new fibreglass layers, ensuring proper adhesion between the layers.
By following these steps, you will have effectively cleaned and prepared the surface of your old fibreglass boat, laying the foundation for a successful refurbishment.
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Removing old paint and gel coat
One option for removing old paint is to use a chemical stripper. This method is less labour-intensive and cheaper than manually scraping off the paint. It is important to use a stripper specifically designed for marine use, such as Marine Strip, as ordinary paint strippers may not be effective. When using a chemical stripper, follow the instructions carefully, as some products need to be left on for a specific amount of time, such as 12 to 24 hours, while others, like Marine Strip on wood, should not be left on for more than 45 minutes to avoid disaster. After using a chemical stripper, the gel coat will need to be rinsed and treated with a product like Net-trol.
Another method for removing paint is wet sanding, which involves sanding the paint off while the surface is wet. This process can be time-consuming and may not completely remove the paint. It is also important to be cautious when sanding, as it is possible to sand too deeply into the gel coat, causing it to deteriorate rapidly.
After removing the paint, the gel coat may be restored using a product like Gelcoat Restorer. This type of product penetrates deep into the gel coat, restoring shine and pigment while providing a tough and durable finish. However, if the gel coat is in poor condition or has accumulated too many layers of paint, it may be necessary to strip it back to the bare hull and start from scratch. This can be done by manually scraping off the gel coat or using a chemical stripper, as previously mentioned.
It is important to note that some sources suggest avoiding acetone-based strippers as they can damage the gel coat. Additionally, soda blasting, while effective for removing paint, can leave the gel coat scuffed, so it may not be the best option if a smooth finish is desired. Overall, the process of removing old paint and restoring or replacing the gel coat is a crucial step in refurbishing an old fibreglass boat, and the chosen methods will depend on the specific condition and needs of the boat.
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Repairing cracks, holes and blisters
Repairing cracks, holes, and blisters on a fibreglass boat is a meticulous process that requires the right materials and careful attention to detail. Before starting any repair work, it is important to assess the damage caused by external factors such as accidents or collisions. This helps to determine the extent of the damage and whether it is just cosmetic or a more severe structural issue.
For minor cracks, holes, and scratches, epoxy is a popular choice for repairs as it creates a super-strong, waterproof fibreglass repair. To repair minor cracks, start by opening up the cracks using a sharp "V"-shaped tool, such as a can opener with a sharpened tip, to scrape down to the bottom of the cracks. Bevelling the sides of the crack provides a larger surface area for the repair to stick to. Clean the area thoroughly with a mild detergent or gelcoat-specific cleaner to ensure that the repair will adhere well.
If the crack is shallow and the laminate underneath is undamaged, it can be filled with gelcoat alone. Mix a small amount of gel coat and catalyst according to the manufacturer's instructions, and apply it with a clean brush, filling the crack and ensuring it is slightly higher than the surface. Let the gelcoat cure completely (usually 24 hours), then sand the area smooth with wet and dry sandpaper, starting with 220-grit and moving up to finer grits (380, 600, and 1000) for a perfect finish.
For larger repairs, such as gouges, cracks, or holes, polyester gelcoat is a popular choice due to its ease of application and durability. It is often available in various colours to match your boat's existing finish. If the repair is below the waterline, WEST SYSTEM Epoxy provides a strong, water-resistant barrier that prevents moisture from penetrating the hull. Polyester resin is another option for repairs that are not below the waterline. Apply the resin with a roller or squeegee, and if necessary, apply a finishing resin or gel coat to match the colour and finish of the boat.
Blisters are raised, bubble-like formations on the gelcoat surface caused by moisture intrusion into the fibreglass layers. To repair gelcoat blisters, the boat must be lifted out of the water and dry-docked. Use a scraper or a grinder to remove the damaged gelcoat carefully. Once the area is dry, follow the same process as for repairing cracks, filling, curing, sanding, and polishing the repair.
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Sanding and finishing
Before you begin sanding, ensure that you have the right tools and safety equipment. You will need a sander, either a regular dual-action sander or a geared sander, and sanding discs or pads in various grit sizes, such as 24-grit, 36-grit, or 40-grit. Coarser grit sizes are more aggressive and suitable for heavy sanding, while finer grit sizes, such as 180 or 220-grit, are used for a smoother finish. It is recommended to invest in good-quality sanding discs for better results. Additionally, wear safety gear, including strong rubber gloves and eye protection, to safeguard against any debris or chemicals.
If your boat has a gelcoat, which is a protective layer on the fibreglass, you will need to remove it before sanding. Use a detergent to clean the boat first, and then apply acetone to remove the gelcoat. This step is important as it prepares the surface for an even and smooth finish. Once the gelcoat is removed, allow the fibreglass to cure in the sun for 2 to 7 days. Curing helps release any air pockets in the gelcoat, ensuring a smoother sanding process and a better final finish.
When sanding, start with a coarse-grit sandpaper or sanding disc, and apply even pressure as you work on a large area. Crosshatch your sanding pattern by moving diagonally across the surface. For example, start from the top right corner to the bottom left, and then switch to the top left corner to the bottom right. This technique helps achieve a more consistent finish. Be mindful of the pressure applied to avoid overheating the pad and sander, which can gum up the sanding disc. In some cases, using lighter pressure and letting the machine do the work can lead to faster and better results.
After the initial sanding, apply a primer to the surface. Avoid using etching primer as it does not adhere well to fibreglass. Once the primer is set, proceed to sand again with a finer-grit sandpaper. Repeat the process of applying primer or paint, and then sanding with a fine-grit sandpaper between each application. This iterative process helps create a smooth and polished finish.
Finally, finish the refurbished boat by waxing and polishing the fibreglass. While waxing can enhance the shine, using a combination of wax and polish will provide long-term protection for the hull of your boat.
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Frequently asked questions
"Fiberglass Boat Restoration: The Project Planning Guide" by Canning Wayne is a good book to help you plan and organize your boat restoration project. However, if you're looking for a book that provides more technical details on restoration, Don Casey's "Good Old Boat" is a highly recommended option.
You will need a variety of supplies, including boat cleaners, acetone, rubber gloves, wax, polish, marine detergent, screwdrivers, wrenches, containers, measuring cups, stir sticks, and chemical strippers.
The process involves cleaning the boat with a detergent, removing old paint and gelcoat, repairing any blisters, cracks, or delamination, sanding the boat, and finally waxing and polishing the surface.
Common issues include wood rot, structural damage, engine problems, and the overall extent of the repairs needed. It is important to assess the condition of the boat thoroughly before beginning the restoration process.
