Regan Brown
Painting a motorcycle fuel tank can be a tricky task, especially when it comes to plastic tanks. While some people claim that painting plastic gas tanks is impossible, others have found success by using specific techniques and materials. The process typically involves thoroughly cleaning and sanding the tank to create a surface that paint can adhere to, followed by the application of a primer and paint. The type of paint used is crucial, with some recommending catalysed urethane paint for its durability. Additionally, special considerations must be made to prevent issues like bubbling, which can occur due to gasoline fumes permeating through the plastic. With the right approach and products, it is possible to achieve a long-lasting and aesthetically pleasing paint job on a plastic motorcycle fuel tank.
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What You'll Learn
Choosing the right paint
Type of Paint
The type of paint you choose is critical to the success of your project. Some paints, such as Krylon Fusion, have been known to peel off soon after application due to inadequate surface preparation or the release of toxic VOCs. Opt for a paint that is specifically designed for use on plastic surfaces. Catalyzed urethane paint, for instance, is highly recommended for painting motorcycle fuel tanks as it forms a strong chemical bond. Acrylic urethane paints are readily available online and offer a wide range of colour options.
Surface Preparation
Before applying paint, it is essential to prepare the surface of the plastic fuel tank adequately. This includes thoroughly cleaning and degreasing the surface to remove any dirt, grease, or polish that may be present. Sanding is also a crucial step in creating a texture that promotes paint adhesion. Start with a lower grit sandpaper, such as 60 or 80 grit, and gradually increase the grit size up to 220 to achieve a "fur" texture. This process ensures that the paint adheres properly and reduces the risk of peeling.
Fuel Resistance
Consider the fuel resistance of the paint you choose. Since the fuel tank will be in direct contact with gasoline, selecting a paint that can withstand fuel exposure without peeling or discolouration is essential. Some paints, such as Fusion, are known to be plastic-friendly and help seal the tank, preventing gas vapours from permeating the plastic and causing bubbling. You may also explore fuel-resistant coatings offered by companies like PPG Aerospace, which are designed for use on fuel tanks in fighter jets.
Adhesion and Flexibility
To enhance the adhesion of the paint to the plastic surface, consider using an adhesion promoter as a base coat. Additionally, a flex agent can be used to improve the flexibility and durability of the paint job, reducing the chances of cracking or chipping.
Environmental Considerations
When selecting a paint, it is important to consider the environmental impact of the product. Modern water-based automotive paints are not only fuel and solvent-resistant but also environmentally friendly as they do not release toxic VOCs (volatile organic compounds). These paints are widely used in the auto industry and offer a more sustainable option without compromising on quality.
Remember, taking the time to choose the right paint for your plastic motorcycle fuel tank will ensure a long-lasting and attractive finish. Following the above guidelines will help you make an informed decision and achieve the desired results.
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Preparing the surface
The first step in preparing the surface of a plastic motorcycle fuel tank for painting is to empty the tank and let it dry completely. Remove the fuel cap and the fuel pump, or mask them with tape. Next, thoroughly degrease the paint. Dirt, grease, and polish will be embedded in the scratches, so take your time with this step. You may want to degrease the tank again while sanding.
Use sandpaper to sand the tank and sand out any deep scratches and imperfections. Start with a lower grit sandpaper (around 60-100) and work your way up to a higher grit (around 200-1000). The goal is to create a fur texture on the plastic, which will help the paint adhere better. You can use a small squeegee to maintain the curvy shape of the tank and ensure the sandpaper follows the surface correctly. For hard-to-reach spots, you can use Scotch-Brite pads.
If there is any sticky residue remaining, use a degreaser to soften it and then rub it off with your thumb. If there are decals on the tank, you will need to gently sand off the clear coat covering them with dry P400 or wet P800 sandpaper. You can then gently pull off the decals, warming them slightly with a hairdryer if needed.
Once the tank is sanded and smooth, wipe it down with a solvent like enamel reducer to ensure it is free of any wax or oil. You may also want to use a plastic primer on any spots where the plastic of the tank is visible to help the paint adhere better.
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Priming the surface
Start by emptying the fuel tank and removing the fuel cap and pump. If you wish to keep the fuel pump, you can mask it with tape. Use a degreaser to thoroughly clean the surface of the tank. Dirt, grease, and polish can be deeply embedded in the scratches, so take your time with this step. You can use a degreaser to soften any sticky residue and then rub it off with your thumb.
Next, you'll want to sand the tank to create a textured surface for the primer to adhere to. Use a small squeegee to maintain the curvy shape of the tank and ensure the sandpaper follows the surface correctly. This will help you avoid flat spots in the paint. For hard-to-reach spots, you can use Scotch-Brite pads. Start with a lower grit sandpaper, such as 60 or 80 grit, and gradually move to finer grits like 100, 120, and finally, 220 grit. The goal is to achieve a white "fur" texture on the surface of the plastic.
Once you have finished sanding, it is time to apply the primer. Choose a primer specifically designed for plastic surfaces, such as a plastic primer or a product like Ixell-adhera, which aids the adherence of paint to plastic. Make sure to follow the manufacturer's instructions for the best results. Apply the primer evenly and smoothly to the entire surface of the tank, paying extra attention to spots where the plastic is visible.
After priming, you can move on to the next step, which is applying a filler. A two-pack filler is recommended, and you should let it dry thoroughly before proceeding. This will ensure that your paint job lasts longer and has a smooth finish.
Remember, taking your time with the priming process will pay off in the long run, as it will create a strong foundation for your paint job and help prevent peeling and bubbling.
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Applying the paint
Before applying the paint, ensure that you have thoroughly cleaned and sanded the tank to create a smooth surface. It is important to use the correct type of paint and primer to ensure that the paint adheres well to the plastic and is fuel-resistant.
Start by applying a thin coat of primer to the tank. Use a primer specifically designed for plastic surfaces, such as a plastic primer or an adhesion promoter. This will help the paint adhere better and create a more durable finish. Allow the primer to dry completely according to the manufacturer's instructions.
Once the primer is dry, you can begin applying your chosen paint colour. Select a paint that is suitable for plastic surfaces, such as a 2K paint, a water-based automotive paint, or a catalyzed urethane paint. These paints are fuel and solvent-resistant, ensuring a long-lasting finish. Acrylic urethane paints are also an option and can be found at affordable prices. However, ensure proper ventilation and filtration when using these paints to avoid inhaling isocyanates.
Apply thin coats of paint, allowing each coat to dry before applying the next. Use a spray gun or a paintbrush specifically designed for use with automotive paints. Be careful not to apply the paint too thickly, as this can lead to drips and an uneven finish.
After the final coat of paint has dried, finish with a clear coat to protect the paint job and add shine. A 2-pack clear coat is recommended. Again, apply thin coats and allow adequate drying time.
Some sources suggest using a heat gun before painting to ensure better paint adhesion. However, this step should be approached with caution, as excessive heat can damage the plastic.
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Finishing and sealing
Once you are happy with the colour coats, finish with a 2-pack clear coat. If you are using a water-based paint, note that only the base colour coat of the paint system is waterborne; all other layers, including the clear coat, are solvent-based. You can also use a semi-thick coat and let it float out into a smooth surface.
If you are painting over stickers, a clear coat before the graphics is recommended. You can also use clear contact paper, placed in position on the tank like a decal, to protect the paint.
If you are using a 2K paint, you can simply sand the tank, colour coat, and then clear over that, leaving the factory prime intact.
To prevent bubbling, you can use fibreglass resin with a couple of coats and a good sanding/polish. You can also use a plastic-friendly paint to seal the tank and keep gases from permeating the plastic.
If you are coating the inside of the tank, make sure to empty the tank and let it dry thoroughly.
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Frequently asked questions
You should use a catalyzed urethane paint. Acrylic urethane paints are available at a low cost on Amazon. Modern water-based automotive paints are also fuel and solvent-resistant, inexpensive, and do not release toxic VOCs.
Start by emptying the tank and letting it dry. Remove the fuel cap and the fuel pump, or mask them with tape, and thoroughly degrease the paint. Sand the tank with 600-800 grit sandpaper to remove dirt, grease, and polish from the scratches.
Use a quality primer and paint. For the primer, you can use a product like Ixell-Adhera, which aids the adherence of 2-component paint to plastic. After priming, apply the colour coat, then finish with a 2-pack clear coat.
To ensure the paint job lasts, it is important to prepare the surface of the tank thoroughly. Make sure to degrease, sand, and prime the tank before painting. After painting, allow the paint to cure and harden for a few days before applying a clear contact paper over the paint.
