Elena Rossi
Painting the deck of a fibreglass boat is a moderately challenging task that can rejuvenate the appearance of a boat. It requires careful preparation, including repairing any scratches, gouges or cracks, and cleaning the deck thoroughly. It is also important to ensure the deck is completely dry before painting, as fibreglass can be slippery when wet. The paint used for boat decks is very different from that used for other jobs and must include non-slip properties to prevent accidents. There are a variety of paints to choose from, including one-part or two-part polyurethanes, enamels, and two-part acrylics, each with its own advantages and disadvantages.
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What You'll Learn
Preparation: fill holes, fix scratches, and clean the surface
Before painting the deck of a fibreglass boat, it is important to fill holes, fix scratches, and clean the surface. This process can be labour-intensive, so it is important to be sure that you can devote adequate time to the full process.
Start by inspecting the deck for any holes or deep scratches. If there are any, these will need to be filled. The most common way to fill holes and deep scratches in a fibreglass boat is with a gel coat or gel coat paste. If the scratch is relatively deep, use a filler first and then come behind it with the gel coat. The gel coat should match the colour of the boat as closely as possible. This can be challenging, especially if the boat has been in the sun for several years and the colour has faded. If the scratch is only small, you may want to consider buying a pre-assembled kit that contains gel coat and an assortment of tint packs. You can make up several small batches of the gel coat paste and test them out to make sure the colour matches.
Once the gel coat has been applied, you will need to sand it down with 1000 grit wet/dry sandpaper. Be careful not to sand through the gel coat, as this will create more work. After sanding, buff the area to create a smooth finish.
Next, clean the surface of the deck to ensure that the paint will adhere properly. Start by removing any wax and grease from the area with acetone. Then, give the deck a thorough rinse with fresh water and move the boat somewhere well-ventilated where it will have the opportunity to drain and dry without any debris falling on it. It is important to make sure that the deck is completely dry before painting.
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Choosing the right paint: select paint with non-skid properties
Painting the deck of a fibreglass boat is not as straightforward as other painting jobs. One of the most important considerations is choosing the right paint. The paint you select for the deck of your fibreglass boat should have non-skid properties. Fibreglass can be notoriously slippery, especially when wet, so it is important to select a paint that will provide a grippy surface.
There are several types of paint to choose from, each with its own advantages and disadvantages. Single-part enamels are commonly used because they are easy to apply and inexpensive. Single-part polyurethanes are also easy to apply, and their shine lasts longer, but they are more expensive. Two-part polyurethane paint can look better than the boat's original gel coat when applied properly, but it is more costly and requires special primers. Acrylic urethane provides a glossy surface but is usually left to professionals due to its specific requirements.
If you want to include non-skid properties in your paint, you can add non-skid additives. These additives often come in the form of tiny rubberized pellets or beads. When testing paint with non-skid additives, Steve from Cruising World combined equal amounts of coarse and fine grit to prevent the coarse grit from settling in lumps. He also tested different colours, finding that a mixture that was too dark made it uncomfortable to walk barefoot on the deck, while a mixture that was too white caused intolerable glare.
If your boat has moulded-in non-skid, it may be better to cover it with non-skid foam decking or have the decks professionally refinished, as painting it may negatively impact its look and feel.
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Applying the paint: use rollers, brushes, or spray
Painting a fibreglass boat deck is a challenging task that requires careful preparation and the right tools. When it comes to applying the paint, you have a few options: rollers, brushes, or spray.
Rollers are a common choice for painting boat decks. They are suitable for both one-part and two-part paints. When using a roller, it is essential to have a partner assisting with a brush to even out the paint and create a smooth finish. This technique is often referred to as the "roll and tip" or "rolling and tipping" method. It ensures that the paint is evenly distributed and that there are no overlaps or brush marks.
Brushes can also be used for painting boat decks, especially when using single-part enamels. Brushes allow for more precision and control, making them ideal for smaller areas or detailed work. However, when using a brush, it is crucial to follow the manufacturer's instructions and work quickly to avoid brush marks or an uneven finish.
Spraying is another option for applying paint to a boat deck, although it is more commonly used for two-part polyurethane paints. Spraying can provide a smooth and even finish, but it requires more preparation and special equipment. It is important to note that spraying should only be done in well-ventilated areas to ensure the safety of the painter and avoid overspray.
Regardless of the application method chosen, it is crucial to follow the manufacturer's instructions for the specific paint being used. Different paints have varying requirements for preparation, application, and curing. It is also important to ensure that the boat deck is thoroughly cleaned, dried, and masked off to protect unwanted areas from paint splatters.
After applying the paint, it is essential to allow adequate curing time before removing the masking tape and protective coverings. This curing time can vary depending on the paint used and the environmental conditions, so referring to the manufacturer's guidelines is crucial. Once the paint is cured, you can enjoy your freshly painted boat deck and admire your hard work!
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Drying and curing: allow time for the paint to dry and cure
Painting the deck of a fibreglass boat is a time-consuming process that requires patience and attention to detail. After you've prepared the surface, filled in any cracks, and applied the paint, the next critical step is to allow adequate time for the paint to dry and cure.
It is important to remember that the paint needs time to cure completely. While it may appear dry on the surface, the layers underneath could still be wet. The curing time will vary depending on the type of paint used and the environmental conditions, such as temperature and humidity. For example, two-part polyurethane paints require more curing time than one-part polyurethanes. Always refer to the manufacturer's instructions for specific curing times.
During the curing process, it is crucial to keep the area well-ventilated to ensure proper drying. Make sure the boat is stored in a safe place, away from any debris that may fall on the wet paint. It is recommended to start the painting process earlier than planned to account for unexpected delays or weather changes that could affect the curing time.
Allow at least 24 to 48 hours for the paint to cure completely before using the boat again. This duration may vary depending on the paint type and environmental conditions. Re-attach any furnishings or hardware that were removed before painting, but be cautious not to rush this process, as you don't want to disturb the freshly painted surface.
To ensure the longevity of your paint job, consider using a boat wax or polish to protect the surface from UV damage and debris. This extra step will help maintain the shine and appearance of your boat deck while also extending the life of the paint.
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Finishing touches: wax and polish for protection
Once you've painted your fibreglass boat, you'll want to make sure that your hard work is protected. There are a few steps you can take to ensure that your paint job lasts. Firstly, it's important to allow the paint to cure fully before using the boat again. This may take a few days.
After this, you can apply wax to protect the paint from UV damage and debris. You can apply automotive paste wax in a circular motion, and once it is dry, buff the area with an orbital buffer. To achieve the best results, you should wax your boat at least once a year.
You can also use polishes to restore shine to your boat. If your boat has a gel-coated fiberglass liner, you can use a finish-restoring polish. If the gel coat is discoloured, you can use a mild solution of oxalic acid to remove it. If this doesn't work, try a stronger solution, such as a toilet bowl cleaner with a stiff brush, which contains about 10% HCL acid.
If you want to add a non-skid finish to your paint, you can experiment with different additives and grit levels to find the right balance. You can test these on scrap plywood to ensure they won't damage human skin.
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Frequently asked questions
Before painting a fiberglass boat, it is important to clean the surface thoroughly with fresh water and allow it to dry completely. You should also ensure that the boat is in a well-ventilated area to facilitate proper drying. Additionally, you may need to remove hardware, furnishings, or other features that could get in the way of the painting process.
The type of paint you choose depends on the specific area of the boat you're painting. For the boat's hull below the waterline, select a paint with antifouling properties. Above the waterline, you can choose between one-part or two-part polyurethane, enamels, and two-part acrylics. If you're painting a deck, it's essential to choose a paint with non-skid or non-slip properties to prevent accidents.
In addition to the paint, you'll need painter's tape, drop cloths or plastic sheets, liquid soap or boat wash, sandpaper or sanding discs, a roller frame and roller covers, paintbrushes, epoxy primer, and a paint thickening agent. You may also want to use a solvent to clean the surface before painting and a paste wax to protect the paint job once it's dry.
First, prepare the surface by sanding it and applying an epoxy paste to any damaged areas. Then, apply a coat of primer and let it dry. Once the primer is dry, sand the surface again and wipe it down with a solvent or acetone before applying the paint. Use a roller or brush to apply 3-4 coats of paint, allowing each coat to dry before applying the next. Finally, remove the tape and protective coverings, ensuring the paint is fully dry before using the boat again.
