Ethan Clarke
Painting plastic fenders is a great way to update your vehicle without breaking the bank. However, it is important to prep the fenders properly to ensure the paint adheres well and you get a smooth, even finish. The first step is to thoroughly clean the plastic surface with a degreaser/soap and then sand it with fine-grit sandpaper to create a dull finish. Next, you should use a wax and grease remover and a primer to ensure the plastic is ready for painting. Finally, you can start painting, making sure to work in a well-ventilated area and using a paint designed for use on plastic.
| Characteristics | Values |
|---|---|
| Clean the surface | Use a degreaser/soap, wax and grease remover, or alcohol |
| Remove the shine | Use sandpaper or a Scotch-Brite pad |
| Primer | Use a primer made for plastic, such as Krylon Fusion or Duplicolor Plastic Adhesion Promoter |
| Paint | Use a paint made for plastic, such as Krylon Spray Paint or Rustoleum Direct to Plastic Paint |
| Coats | Apply multiple coats of paint and clear coating |
| Ventilation | Work in a well-ventilated area or wear a painter's filtered mask |
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What You'll Learn
Clean the surface with a degreaser/soap and remove the shine
To prep plastic fenders for paint, it is crucial to clean the surface thoroughly with a degreaser or soap. This step ensures that any grease, dirt, or impurities are removed, providing a clean canvas for the paint to adhere properly. It is important to note that a shiny surface can hinder the paint's adhesion, so removing the shine is essential.
One recommended method is to use a product like Ajax, a powder with bleach that can be purchased from a grocery store. Using a Scotch-Brite pad or a similar abrasive pad, scrub the plastic surface until the shiny film is gone, and a dull finish is achieved. This process may take some time and effort, but it is crucial for the paint to adhere correctly. It is also suggested to use soap and water while sanding to create tiny scratches that the paint can grip onto.
Another approach is to use a wax and grease remover, which effectively eliminates any residual wax or grease that may interfere with the paint's adhesion. This step is critical, as it ensures that the surface is entirely free of any substances that could prevent the paint from bonding properly. After using the remover, it is essential to wipe down the surface with a clean cloth to ensure no residue is left behind.
Additionally, some professionals recommend using a DA sander with 180-grit dry sandpaper to scuff the surface and create a uniform texture. This step helps achieve a smooth finish and ensures that the paint will adhere evenly. It is important to be thorough during this step, as any missed spots can affect the final result.
Once the surface is adequately scuffed and cleaned, it is essential to ensure it is entirely dry before proceeding to the next step. This may involve waiting for a specific amount of time, depending on the products used and the environmental conditions. A hairdryer or similar tool can also be used to expedite the drying process if necessary.
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Sand the surface with sandpaper or a Scotchbrite pad
Sanding the surface of plastic fenders is an important step in preparing them for painting. It helps create a smooth and even surface for the paint to adhere to and ensures that the paint job lasts longer.
You can use sandpaper or a Scotchbrite pad to sand the surface. If using sandpaper, it is recommended to use fine-grit sandpaper, such as 320-grit or higher. This will create a smooth finish without leaving deep scratches on the plastic. Wet the sandpaper with soap and water before sanding to help create an even smoother finish.
Start by lightly sanding the entire surface of the fender to remove any shine and create a dull finish. You can use a Scotchbrite pad or sandpaper for this initial step. Continue sanding until the surface is smooth and even, with no visible shine. Pay close attention to the edges and any curved areas, as these spots may require more sanding to ensure an even finish.
If you are removing an old coat of paint or need to sand off any imperfections, you may need to use a coarser grit sandpaper initially. However, be sure to finish with a finer grit to create a smooth surface for painting. It is important not to over-sand the plastic, as this can damage the surface and affect the adhesion of the paint.
Once you have finished sanding, be sure to wipe down the surface with a clean cloth to remove any dust or debris. This will ensure that the surface is ready for the next steps in the painting process, such as applying a primer or adhesion promoter.
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Apply a wax and grease remover
To prep plastic fenders for paint, one of the critical steps is to apply a wax and grease remover. This step is essential to ensure that the paint will adhere properly to the plastic surface. It is important to start with a clean surface, so the first step is to thoroughly wash the plastic with a degreaser or soap.
After the plastic has been washed and dried, it is time to apply the wax and grease remover. This product will help to strip away any remaining residue, such as wax, grease, or oil, that could interfere with the paint adhesion. It is important to follow the instructions on the product you are using, as different brands may have specific instructions or application methods. Generally, you will want to apply the wax and grease remover with a clean cloth, working it into the surface of the plastic fender in small sections.
It is important to wear gloves during this process to protect your hands from the chemicals in the remover. You may also want to consider eye protection and a respirator to avoid any irritation from the fumes. Work in a well-ventilated area to further reduce the impact of fumes.
Once you have applied the wax and grease remover, you will want to wipe the surface with a clean, dry cloth to remove any remaining residue. This step will ensure that the surface is completely free of any contaminants and will help to create a smooth base for the paint to adhere to.
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Use a plastic adhesion promoter
To prep plastic fenders for paint, one of the key steps is to use a plastic adhesion promoter. This is a product that is designed to help the paint adhere to the plastic surface and prevent it from chipping or peeling off over time.
There are several plastic adhesion promoters available on the market, such as the Bulldog adhesion promoter, Duplicolor Plastic Adhesion Promoter, and SEM plastic adhesion promoter. These products are available on Amazon or eBay and are often sold as bonding agents or adhesion promoters for automotive paint. It is important to choose a product that is suitable for use on plastic surfaces.
Before applying the adhesion promoter, it is crucial to clean and prepare the plastic surface thoroughly. This includes sanding the surface to create a dull finish and remove any contaminants that may prevent the paint from adhering properly. A Scotch-Brite pad or sandpaper with a grit of 320-400 can be used for this step. After sanding, the surface should be cleaned with a plastic cleaner or degreaser to ensure that there are no remaining contaminants.
Once the surface is clean and dry, the adhesion promoter can be applied. It is recommended to use a couple of coats of the promoter to ensure a strong bond. After applying the adhesion promoter, the next step is to apply a high-build primer or surfacer. This will fill in any imperfections in the plastic and create a smooth surface for the paint to adhere to.
It is important to note that while adhesion promoters can enhance the durability of the paint job, some people choose to skip this step, especially for ATVs or dirt bikes, as they do not expect the paint to last for a very long time.
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Prime and paint
Before you begin, ensure your workspace is well-ventilated and consider using a painter's filtered mask to protect yourself from paint fumes.
If your fender is new and has a textured surface, you may not need to sand it. However, if your fender is already painted, you will need to sand it to create an even surface for the new paint to adhere to. Use a Scotch-Brite pad or sandpaper with a grit of 320 or higher to sand the fender until the shiny finish is gone and you are left with a dull, smooth surface. If you are using sandpaper, use soap and water while sanding to create tiny scratches for the paint to hold on to.
Once the fender is smooth and even, wipe it down with a wax and grease remover to ensure any remaining residue is removed. You can then apply a plastic adhesion promoter to help the paint stick to the plastic surface.
Next, apply a high-quality primer to the fender. Spray the fender with 2-3 fine coats of primer, allowing each coat to dry completely before applying the next. It is important to follow the manufacturer's instructions for drying times.
After the primer is dry, you can begin painting. Choose a paint that is specifically designed for use on plastic surfaces, such as Krylon Spray Paint, which has a 360-degree dial spray tip for easy application. Hang the fender up and angle it slightly to help cure the paint. Start painting from the bottom and work your way up to achieve a smoother finish. Apply 2-4 light coats of paint, allowing each coat to dry before applying the next.
Finally, apply a clear coat to protect the paint job. Apply 2-3 coats of clear coating, allowing each coat to dry completely before moving on to the next step.
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