Isabella Flores
Painting the bottom of a boat is known as bottom painting or antifouling. It is a preventative maintenance task that protects the hull from saltwater corrosion and the growth of organisms. Bottom painting is especially important for pontoon boats as marine growth can reduce speed by 10 miles per hour or more. Before bottom painting, it is important to prep the boat by cleaning and sanding the hull and applying a coat of aluminum sealer. The type of paint used is critical as the wrong paint can damage the hull. For example, a copper-based paint will damage an aluminum hull. The application process is also important for the longevity of the paint.
| Characteristics | Values |
|---|---|
| When to paint | If the boat is kept in saltwater or in the water for extended periods |
| Type of paint | Antifouling paint, epoxy paint, ablative paint |
| Paint ingredients | White copper, zinc, ECONEA, aluminium |
| Paint colour | Bright colours, white, black |
| Paint brand | Interlux Trilux, Pettit Vivid, West Marine BottomShield, Interlux Fiberglass Bottomkote NT |
| Paint cost | $25 per foot per pontoon for aluminium boats, $50 per foot for fibreglass boats |
| Preparation cost | $90 per hour |
| Preparation tools | Tyvec suit, full-face respirator, chemical-resistant gloves, roller handles, rollers, painter's tape, boat blocks, scraper, sandpaper, pressure washer |
| Boat position | On a trailer, on a hill, on its side |
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What You'll Learn
Preparing the pontoon boat for painting
Once the paint type is selected, prepare the work area. For small boats, this may involve simply lifting the boat onto its side. For larger boats, the boat can be placed on a trailer, with the stern raised to access the underside. Cover the trailer with protective material, such as wood, carpet, or firm rubber, to avoid damaging the hull. Tape the trailer to ensure a clean paint job.
Next, clean the hull thoroughly. If there is existing paint, determine whether it needs to be removed or if you can paint over it. If removing, use a scraper and sandpaper to strip the paint and any barnacles, corrosion, or other buildup. Power washing can also be effective for removing marine growth. If painting over existing paint, ensure the new paint is compatible with the old paint to avoid issues.
Before painting, apply a coat of aluminium sealer to the entire boat. If the boat has no previous coatings, sand the pontoons with 80-grit sandpaper to roughen the surface and improve adhesion. Then, apply a water-tight barrier coat, such as Tuff Stuff High Build Epoxy, to protect against corrosion and aid paint adhesion. For aluminium boats, it is crucial to use aluminium-safe antifouling paint to avoid corrosion and damage.
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Choosing the right paint
Firstly, if your boat is stored in water for long periods, you will need antifouling paint. Antifouling paint is designed to be ablative, meaning it can be removed easily to get "hard" growth off the boat. Antifouling paint also helps to prevent the growth of organisms on your hull, which can break through the gel coat of a fibreglass boat and permeate the fabric of the boat, leading to blistering and water damage. Antifouling paint is also important if you boat in saltwater, as saltwater speeds up the oxidation and electrolysis processes. Antifouling paint with a biocide that contains white copper (cuprous thiocyanate), zinc or ECONEA® will dazzle. White copper is used in brightly coloured paints and produces the brightest colours, whitest whites and blackest blacks. ECONEA is a metal-free biocide that can be as effective as cuprous oxide at about one-tenth of the concentration in paint by weight, resulting in a brighter range of colours compared to darker cuprous oxide-based paints.
If you are in a region where you dry-store your boat in winter, a modified epoxy paint is a good choice. These paints offer a hard, durable finish and are more environmentally friendly than traditional cuprous oxide paints. However, if you have an aluminium-hulled pontoon boat, you must not use copper-based antifouling paint as it will cause corrosion and holes in your boat. Instead, you should use an aluminium protection product and an epoxy coating to protect your boat from the bottom paint and then apply two coats of bottom paint. You should also ensure you use an aluminium-safe antifouling paint.
If your boat is going to be trailered, you would usually use an epoxy paint that is hard and durable. For the visible parts of the boat, you can use a two-part urethane paint as it looks nicer.
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Painting techniques
Before painting the bottom of your pontoon boat, it is important to prepare the boat and the work area. If your boat has been in the water, it may have accumulated marine growth, which will need to be scraped and ground off. You should also ensure your work area is well-ventilated and you are wearing protective gear, including a Tyvec suit, a full-face respirator, and chemical-resistant gloves.
The type of paint you use will depend on the material of your boat and whether it will be kept in the water or trailered. For example, if you have an aluminum-hulled pontoon boat, you will need to use an aluminum protection product, such as Tuff Stuff High Build Epoxy, followed by an epoxy coating and an aluminum-safe antifouling paint. On the other hand, if your boat is made of fiberglass, you can use a copper-based antifouling paint to prevent marine growth.
When applying the paint, it is recommended to start by marking the boat's waterline. You can then spray the top of the boat with a quality paint above the waterline and brush or roll on the antifouling paint below the waterline. For a small boat, you may be able to simply lift it onto its side to paint the bottom. For larger boats, you can use a trailer or a boat lift to access the bottom. You may need to get creative with blocks and jacks to lift the boat and access all areas.
It is important to follow the manufacturer's instructions for the paint you are using, including the recommended temperature and humidity ranges for application. Additionally, be sure to allow sufficient time for each coat of paint to dry before applying the next coat.
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Avoiding common mistakes
Painting the bottom of a pontoon boat is a great way to protect the hull from the elements and improve the boat's performance. However, there are several common mistakes that boat owners should avoid when painting the bottom of their pontoon boat.
Firstly, it is important to choose the right type of paint. Pontoon boats require a different type of bottom paint than wooden or fiberglass boats because the paint reacts differently depending on the material it is applied to. Using the wrong type of paint can damage the boat; for example, using the wrong kind of anti-fouling paint without a barrier coat can cause holes in an aluminium boat. It is also important to avoid copper-based paints, as these can cause pitting and weak spots in the hull.
Secondly, it is crucial to properly prepare the boat before painting. This includes cleaning the hull and ensuring that it is free of any marine growth or oxidation. It is also important to mark the waterline and only apply antifouling paint below this line, as antifouling paint is toxic and can be harmful to people. Additionally, the entire boat should be sprayed with an aluminium sealer before painting.
Another common mistake to avoid is not allowing enough time for the paint to dry completely before launching the boat. This can result in an uneven or patchy finish. It is also important to follow the instructions on the paint carefully, including any recommendations for the number of coats to apply. Applying too few coats can result in inadequate protection, while applying too many coats can add unnecessary weight to the boat.
Finally, it is important to consider the size and weight of the boat when deciding how to paint it. For larger boats, it may be necessary to use a specialised boat lift or to get creative with the use of jacks and blocks to ensure that the entire bottom of the boat can be accessed for painting.
By avoiding these common mistakes, pontoon boat owners can ensure that their boats are properly protected and maintain the visual appeal and performance of their vessels.
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Maintaining the paint job
Cleaning and Maintenance:
Regular cleaning of the hull is essential to prevent discolouration and permanent staining. Saltwater speeds up oxidation, leading to discolouration, so frequent cleaning is necessary if the boat is used in saltwater. Use a pressure washer to remove any build-up of marine growth, such as algae, and scrub away any growth that the antifouling paint may not prevent.
Inspect for Damage:
Before applying a new coat of paint, inspect the hull for any signs of damage. Look out for corrosion, pitting, or holes caused by corrosion. If you find any issues, repair them before proceeding with a new paint job.
Prepare the Surface:
To ensure a smooth and durable paint finish, prepare the surface by sanding the pontoons with 80-grit sandpaper. This process will create a rough surface for better paint adhesion and help remove any minor imperfections. After sanding, apply a suitable primer, such as Tuff Stuff High Build Epoxy, which is specifically designed for use under the waterline with aluminium hulls.
Choose the Right Paint:
Select a high-quality antifouling paint that is compatible with the previous coat. Aluminium pontoon boats require aluminium-safe antifouling paint to prevent corrosion. If your boat is stored in saltwater, choose a paint with a biocide, such as copper or zinc, to prevent organisms from attaching to the hull. For freshwater use, you may opt for a different type of paint, such as a two-part urethane paint, which provides a nicer appearance.
Apply the Paint:
Follow the manufacturer's instructions for application, ensuring the temperature and humidity are within the recommended range. Typically, boat paint should be applied when temperatures are between 50°F and 85°F, and humidity is below 65%. Apply the paint using rollers and brushes, ensuring a thorough and even coat.
Regular Repainting:
Antifouling paint is designed to be ablative, meaning it wears off over time, taking any marine growth with it. Therefore, regular repainting is necessary to maintain the protection and appearance of your pontoon boat. The frequency of repainting depends on various factors, including the type of water, the duration of storage, and the application process.
By following these comprehensive maintenance steps, you can ensure that the paint job on the bottom of your pontoon boat remains in good condition, providing both protection and aesthetic appeal.
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Frequently asked questions
You should use an aluminium-safe antifouling paint. Antifouling paint prevents the growth of marine life on the hull of your boat. Tuff Stuff High Build Epoxy is a water-tight barrier coat designed for use under the waterline with aluminium hulls.
First, prep the boat by removing all hardware and repairing any surface imperfections. Then, wash, de-wax and sand the surface. Next, apply a primer, and then the paint. Finally, wax the boat to protect the new paint job.
It is important to follow the manufacturer's instructions for the paint you are using. You should also be mindful of the temperature and humidity when painting your boat. Manufacturers recommend painting when temperatures are between 50°F and 85°F and humidity is below 65%.
