Bedding An Aluminum Boat Tank: The Ultimate Guide

Aluminum is a common material for boat tanks, and with proper maintenance, they can last for decades. However, improper installation can lead to issues such as corrosion and leakage. To bed an aluminum boat tank correctly, it is important to follow certain guidelines. The tank should be made of marine-grade aluminum alloy, with mounting brackets welded on for secure installation. The use of bed liner material as a coating can also improve durability. Additionally, it is crucial to ensure that the tank is mounted on a material that does not retain moisture and allows airflow. This helps prevent corrosion by keeping the aluminum dry. Properly bedding an aluminum boat tank can be a complex process, but it is essential to ensure the longevity of the tank and the boat.

Use a self-etching primer before applying a bed liner coating

When applying a bed liner coating to an aluminium boat tank, it is important to use a self-etching primer first. This is a crucial step in the preparation process and will ensure that the bed liner coating adheres well to the aluminium surface.

Self-etching primers are designed to promote excellent paint adhesion to difficult substrates such as aluminium. They create an anti-corrosive barrier that prevents aluminium from corroding and enables you to prime and protect bare metal in one step. It is important to follow the instructions on the primer and allow it to dry completely before applying the bed liner coating.

One recommended product is the Custom Coat Self Etching Acid Etch Primer, which is an automotive and industrial primer specifically designed for use on bare metal areas before applying a truck bed liner. It provides excellent anti-corrosion properties, fast-drying, and a super smooth finish. It can be directly top-coated without sanding and works great under all major brands of truck bed liner.

Another option is Rust-Oleum's self-etching primer, which can also be used to prepare metal surfaces before painting. It is important to note that proper preparation is key to ensuring the bed liner coating adheres well and lasts for years to come. This includes cleaning the surface with soap, water, and acetone, as well as scuffing or sanding the surface to create a rough texture for the primer to adhere to.

By following these steps and using a self-etching primer before applying a bed liner coating, you can be confident that your aluminium boat tank will have a durable and long-lasting finish.

Avoid using carbon-based materials with aluminium

When bedding an aluminium boat tank, it is important to avoid using carbon-based materials with aluminium. This is because carbon and aluminium, when in contact with each other, can create a battery-like reaction, leading to corrosion and degradation of the aluminium. This is especially true in the presence of an electrolyte, such as saltwater.

To avoid this issue, it is recommended to use a non-carbon-based material as a barrier between the aluminium and any carbon-containing substances. One option is to use a continuous layer of 5200 or 4200, which will "insulate" the aluminium and prevent direct contact with carbon. Another option is to use a non-carbon-based adhesive, such as epoxy, to bond the aluminium to other materials.

Additionally, it is important to properly prepare the surface of the aluminium before applying any coatings or adhesives. This includes cleaning, sanding, and/or using a self-etching primer to ensure good adhesion and prevent corrosion.

By following these guidelines, you can help ensure the longevity of your aluminium boat tank and avoid the issues associated with carbon-aluminium contact.

Furthermore, the use of carbon-based materials can have a significant environmental impact. Carbon-intensive production processes, such as those used in aluminium smelting, contribute to high carbon emissions. By avoiding the use of carbon-based materials, you can reduce your carbon footprint and contribute to a more sustainable future.

Avoid rubber mounting for aluminium tanks

When installing an aluminium fuel tank, it is important to note that tanks should not be mounted on rubber. This is because materials with carbon should be avoided or, at the very least, not in direct contact with aluminium.

If you are looking to add some support to the underside of the tanks, you could consider using neoprene rubber pads. However, it is important to note that the carbon in the rubber will react with the tank. To avoid this, you could try to isolate the rubber from the aluminium. One way to do this is by gluing sprinkler pipes to the rubber. Another option is to use plastic strips, such as polyethylene, to provide support.

Foaming the tanks in is another widely used method to install aluminium tanks. However, proper tank preparation is crucial for this method. The tanks must be etched, primed, and painted under the right conditions using the appropriate paints. Additionally, the foam must be poured under ideal conditions to ensure proper adhesion to the tank, with no voids.

Coat the tank with bed liner material for durability

To bed an aluminum boat tank, one of the crucial steps is coating the tank with a bed liner material to enhance its durability. This process provides an extra layer of protection, ensuring the tank can withstand harsh conditions and resist damage. Here's a detailed guide on coating the tank with bed liner material:

Prepare the Surface: Before applying the bed liner material, it's essential to prepare the surface of the tank properly. Clean the tank thoroughly to remove any dirt, grease, or debris. Use a suitable solvent or degreaser to ensure the surface is free from any contaminants. You may also need to sand the surface lightly to create a rough texture, which will help the bed liner material adhere better.

Choose the Right Bed Liner Material: Select a bed liner material specifically designed for use with aluminum. There are various options available, including spray-on and roll-on bed liners. Consider the durability, adhesion, and corrosion resistance of the material. Choose a reputable brand known for its high-quality coatings.

Protect the Surrounding Areas: Tape off or cover any areas that you don't want to coat with the bed liner material. This includes fittings, hoses, and surrounding boat components. Use masking tape and newspaper or plastic sheeting to ensure precise application and avoid unwanted overspray. Ensure that the covered areas are secure and no part of the tank is exposed accidentally.

Apply the Bed Liner Material: Follow the manufacturer's instructions for the chosen bed liner material. This may involve mixing the material properly and using the appropriate application method, such as a spray gun or roller. Maintain consistent coverage and achieve the recommended thickness. Apply multiple thin coats rather than a single thick coat for better adhesion and a smoother finish.

Cure and Inspection: Allow the bed liner material to cure as per the manufacturer's guidelines. This could involve leaving the tank for a specified period without disturbance. After curing, inspect the coating for defects like bubbles, cracks, or uneven areas. If necessary, lightly sand and recoat any areas requiring correction, ensuring a consistent and defect-free finish.

By following these steps, you can effectively coat the aluminum boat tank with a bed liner material, adding the desired layer of protection and durability. Remember to refer to the specific instructions provided by the bed liner manufacturer to ensure optimal results and adhere to safety precautions during the application process.

Use a continuous layer of 5200 to insulate neoprene from aluminium

When installing an aluminium fuel tank in a boat, it is important to ensure that the tank is not mounted on rubber. Neoprene can be used, but it must be 'insulated' from contact with the aluminium. This can be done by applying a continuous layer of 5200.

To do this, first, ensure that the aluminium surface is clean and scuffed. This will help the 5200 adhere better. Then, apply a generous amount of 5200 to the surface, creating a continuous layer. Make sure that there are no voids or crevices between the aluminium and the 5200. This will help to ensure a strong bond and provide effective insulation.

Once the 5200 is applied, you can then place the neoprene on top. Again, ensure that there are no gaps or crevices between the materials. The goal is to create a secure and insulated mounting for the tank. It is important to avoid any materials with carbon when working with aluminium, as this can cause issues.

Additionally, when working with 5200, it is important to note that it is not a quick-curing adhesive. It can take a couple of weeks to fully cure, and even longer if it hasn't been kneaded properly prior to use. So, if you are using 5200 as an adhesive, you may need to use some form of mechanical fastening to hold the pieces together while the 5200 cures.

Frequently asked questions