Omar Khalid
Refinishing a plastic bumper involves repairing and restoring the bumper to its original appearance. The process includes grinding, sanding, sculpting, and painting, and can be done at home or by a professional. The first step is to identify the type of plastic the bumper is made of, as this will influence its adhesiveness to certain paints and repair products. Once the plastic type is identified, the appropriate repair process can be chosen, which may include filling in cracks and scratches with body filler or putty, sanding, and applying primer and paint. With the right tools and products, refinishing a plastic bumper can restore its appearance and enhance the overall look of a vehicle.
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What You'll Learn
Identify the type of plastic
There are two major categories of plastic: thermoplastics and thermosets. The type of plastic your bumper is made of will determine the refinishing products you will need to use.
Thermoplastics are plastics that melt. They are semi-rigid and usually require an adhesion promoter. To identify if your bumper is made of thermoplastic, look at the colour of the raw plastic. If it is black or grey, it is likely a thermoplastic. You can also check for an ID mark on the back of the bumper cover.
Thermosets are plastics that do not melt. They are flexible and do not require an adhesion promoter. To identify if your bumper is made of thermoset, again look at the colour of the raw plastic. If it is yellow or tan, it is likely a thermoset.
Polypropylene is the most commonly used plastic in automotive manufacturing. It is a thermoplastic polymer with excellent chemical and heat resistance and is generally resistant to impact. It is also economical and can easily be formed into almost any shape, making it a popular choice for car bumpers.
Other common plastics used in car bumpers include polyvinyl chloride (PVC), polyurethane, and polycarbonate. PVC is flame retardant, has good flexibility and thermal stability, and can be formed into either flexible or rigid components. Polyurethane is known for its toughness, flexibility, and resistance to abrasion and temperature. Polycarbonate is 250 times stronger than glass and is often used for headlight lenses in addition to bumpers.
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Remove the bumper
Removing the bumper is the first step in refinishing a plastic bumper. This process involves detaching the bumper from the vehicle to access the damaged areas and facilitate the repair process. Here is a detailed guide on how to remove the bumper:
Locate the screws and clips: Bumper removal typically begins with locating and removing the screws and clips that secure the bumper to the vehicle. These fasteners are usually found on the top, sides, and underneath the bumper. Open the hood, trunk, and wheel wells to access these areas.
Remove the retaining screws and clips: Once located, use appropriate tools to remove the screws and clips. This may involve unscrewing fasteners or releasing clips from their attachments. Be cautious as the plastic covering screws can be tricky to find and remove. Common locations include under the tail lights, behind the wheel wells, and below the trunk latch.
Detach the bumper: After removing the fasteners, carefully pull the bumper away from the vehicle. Apply gentle and even force to detach it without causing further damage. It is advisable to have an extra pair of hands to support the bumper during this step.
Clean the bumper: With the bumper removed, it is essential to clean it thoroughly. Use a car wash soap that is free from gloss enhancers or wax to wash off dirt and grease. Ensure the bumper is completely dry before proceeding to the next step.
Inspect and mark flaws: Before beginning the repair process, conduct a deep examination of the bumper to identify and mark any flaws or damaged areas. This step helps in determining the extent of the damage and deciding on the appropriate repair techniques.
Identify the plastic type: To ensure compatibility with adhesives and fillers, identify the type of plastic your bumper is made of. Look for a stamp or code on the inside of the bumper, indicating the plastic type (PP, PPO, TPE, PUR, or TPUR). This information will guide your choice of repair products.
Prepare the work area: Choose a warm and dry place to work, as it is crucial for the proper curing of repair adhesives. Gather all the necessary repair products, consulting with experts at auto parts stores to ensure compatibility with your specific bumper's plastic type.
By following these steps, you can successfully remove the plastic bumper from your vehicle, setting the foundation for the subsequent repair, sanding, sculpting, and refinishing processes. Remember to work in a well-ventilated area and wear appropriate protective gear during the removal and repair processes.
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Clean the bumper
To refinish a plastic bumper, the first step is to clean the bumper thoroughly. This process will differ depending on the extent of the damage. If the bumper is cut or torn, scrub both the inner and outer surfaces. Then, rinse the bumper and let it dry. Next, wipe the area with a prep solvent, moving in only one direction, and let it dry.
After the solvent has dried, you will need to sand the area. However, before sanding, it is important to identify the type of plastic your bumper is made of. Look for a stamp on the inside of your bumper labelling it as PP, PPO, TPE, PUR, or TPUR. This is important because different types of plastic require different tools and techniques for sanding. For example, plastics that powder when sanded (PUR, TPUR) should be cut with a 24-grit disc on a sander, while plastics that smear when sanded (PP, PPO, TPE) should be worked on with a cordless drill and a rotary file.
If your bumper has scratches and imperfections all over, it is recommended to sand the entire bumper. Start with 180-grit sandpaper, then move to 320-grit, and finish with 400-grit to achieve a smooth enough surface for primer and paint. If there are only a few spots that need repair, sand those areas down to 180-grit, apply body filler, and then sand again with 320-grit and 400-grit sandpaper.
After sanding, the bumper should be cleaned again using a plastic degreaser to ensure the surface is free of any grease or wax that could hinder adhesion. You can use a grease and wax remover for this purpose, followed by an alcohol-based cleaner to remove any water-based contaminants such as fingerprints or sweat. Finally, before applying any paint or filler, check the compatibility of the products with the type of plastic your bumper is made of, as indicated on the product's technical data sheet.
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Sand the bumper
Sanding the bumper is an important step in refinishing a plastic bumper. It helps to smooth out the surface and prepare it for primer and paint. Here is a step-by-step guide to sanding a plastic bumper:
Firstly, it is important to identify the type of plastic the bumper is made of. This will influence the sanding process and the compatibility with different adhesives and fillers. Look for a stamp or code on the inside of the bumper that indicates the type of plastic, such as PP, PPO, TPE, PUR, or TPUR.
Before sanding, ensure that the bumper is clean and free of any dirt, grease, or contaminants. Use a plastic surface cleaner or a grease and wax remover to prep the surface. Alcohol-based cleaners can also be used to remove water-based contaminants.
If the bumper has any deep cuts or tears, it is recommended to scrub the inner and outer surfaces, rinse, and let it dry before sanding. For plastics that powder when sanded (PUR, TPUR), use a 24-grit disc on a sander to create "V" grooves in the damaged area, which will provide more surface area for the repair material to adhere to. For plastics that smear when sanded (PP, PPO, TPE), use a cordless drill and a rotary file to create the grooves.
Choose the appropriate sandpaper grit for the sanding process. Start with a medium grit, such as 180-grit or 220-grit, to remove any clear coat or failed paint. Then, progress to finer grits, such as 320-grit and 400-grit, to smooth out the surface and remove any scratches. The higher the grit, the less aggressive the scratches will be. Use a soft sanding block or a sanding sponge for hard-to-reach areas.
If you encounter bare plastic during the sanding process, apply a plastic adhesion promoter to enhance the adhesion of the putty. After applying a plastic putty to fill in any cracks or scratches, sand the excess putty to level and even the surface.
Finally, once you have finished sanding, clean the surface thoroughly with a plastic degreaser to remove any residue before moving on to the next steps of refinishing.
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Prime and paint
Before priming, it is important to prepare the surface of the bumper. This involves cleaning, repairing the failed clear coat, filling in the voids of damaged areas, and sanding through various grits. You can use a pressure washer to remove the peeling clear coat, but be sure to use the least aggressive sprayer tip to avoid blasting the paint and primer off. Once the clear coat is removed, sand the surface with 180-grit sandpaper to smoothen it and create a uniformly smooth surface for painting.
After sanding, thoroughly clean all surface areas with a paint prep product to remove any dust left over from the sanding process. Wipe everything dry with a clean microfiber towel.
If your bumper did not come with a pre-coat of primer, you will need to apply a primer to ensure the paint adheres properly. Choose a primer that is compatible with plastic, as some products do not adhere well to plastic surfaces. You can use a spray gun or aerosol primer for application. Apply the primer evenly across the surface of the bumper, following the directions provided by the manufacturer.
Once the primer is dry, you can proceed with painting. Choose a paint that is compatible with the type of plastic your bumper is made of. It is recommended to use a spray can or paint gun to apply the paint evenly without dribbles, splatter, or runs. Apply 2-3 coats of paint, allowing sufficient drying time between each coat to avoid a mushy finish.
Finally, consider applying a clear coat using the same brand as before, which will provide additional protection and a glossy finish to your bumper.
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Frequently asked questions
The first step is to remove the bumper from the car to work on it properly. The bumper is usually held onto the vehicle with clips and screws, which can be found on the top of the bumper, underneath it, and on the sides attached inside the wheel well.
After removing the bumper, give it a good wash with car wash soap that does not contain any gloss enhancers or wax. You only want to wash off the dirt and grease on the bumper.
First, identify the type of plastic the bumper is made of by finding the code corresponding to the type of plastic on the part's inner side. Then, repair the major damage so that it is structurally sound. Next, fill in the damaged parts of the bumper with body filler and sand it smooth.
Start with a coarse grit such as 180-grit to sand out the damaged clear coat. Then, work your way up to 320-grit and finally 400-grit to fully remove the damaged coat and reduce the scratches.
Before painting, clean the surface of the bumper with a plastic degreaser. If the plastic is compatible with the filler, apply a plastic adhesion promoter to enhance the putty's adhesion. Then, apply a plastic putty to fill in any remaining cracks and scratches. Finally, sand the putty to level and even the surface before painting. For additional tips, refer to sources on specific products and tools for refinishing a plastic bumper.
