Sofia Martinez
Repainting a plastic bumper cover is a great way to give your car a new look. It is also one of the most common procedures in auto body shops, as bumpers are easily exposed to damage. Before painting, it's important to identify the type of plastic your bumper is made of, as this will influence its adhesiveness to certain paints. Once you've determined the plastic type, you can choose the right filler and adhesion promoter. The next step is to thoroughly clean and degrease the bumper, and then sand any scratches or cracks. After that, you can start painting, but make sure to follow the specific instructions for the products you're using. Finally, allow ample time for the paint to dry and cure before reattaching the bumper or driving your car.
Characteristics and Values Table for Repainting a Plastic Bumper Cover
| Characteristics | Values |
|---|---|
| Identify the type of plastic | PP (polypropylene), PPO (polyphenylene oxide), TPE (thermoplastic elastomer), PUR (polyurethane plastic rigid), TPUR (thermoplastic polyurethane elastomer) |
| Identify the correct filler | Consult an auto repair store to find the right adhesive and filler for the type of plastic |
| Remove the bumper cover | Unscrew, unbolt, or unfasten the plastic cover |
| Clean the bumper cover | Wash thoroughly with degreaser, water, detergent, and/or a plastic surface cleaner |
| Sand the bumper cover | Use sandpaper (600 or 1500 grit) or a sanding sponge for rough spots, scratches, and imperfections |
| Apply adhesion promoter | Use a plastic adhesion promoter on bare areas of "live" plastic to enhance putty adhesion |
| Apply filler | Mix equal parts filler and hardener, then apply a light layer to fill damaged spots |
| Apply putty | Use plastic putty to fill cracks and scratches, then sand excess putty to level the surface |
| Apply paint | Spray on a base coat layer, then sand and wipe the bumper after each layer. Apply a clear coat to seal the base coat |
| Drying time | Allow at least 6 hours of drying time for the paint to harden, but 24 hours is recommended for maximum durability |
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What You'll Learn
Identify the type of plastic
Identifying the type of plastic your bumper is made of is crucial, as it influences its adhesiveness to certain paints. Vehicle manufacturers generally mark major plastic parts with letter-coded groups moulded at the back of the parts. However, these identifiers are seldom stamped and are often missing. In such cases, other methods of identification, such as burning a sliver of the mystery plastic and naming it based on the colour of the flame or the smell of the smoke, have been used by painters.
When identifying the type of plastic, it is essential to consider the compatibility of the plastic with the chosen repair method. For example, check whether the plastic is compatible with the direct application of a filler, which can be determined by referring to the technical data sheet. If the plastic is not compatible with the filler, an adhesion promoter for fast-drying plastics can be applied.
Additionally, the type of filler used depends on the type of plastic your bumper is made of. This information is usually indicated on the back of the bumper cover with a stamp. It is important to note that adhesion promoters are designed for bare plastic and should not be applied over painted or primed surfaces.
Identifying the type of plastic is a critical step in the bumper repair and painting process. By understanding the plastic type, you can ensure the successful adhesion of paints and coatings, ultimately achieving a professional-quality finish.
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Remove the bumper cover
Removing the bumper cover is the first step in repainting a plastic bumper. The process will differ depending on the make of your car, so it is important to first identify the connection points and fasteners used to attach the plastic cover. These could be screws, tabs, bolts, or other fasteners, and they may be located near the trunk latch, tail lights, or wheel wells, or hidden beneath the bumper fascia. Once you have identified the connection points, remove the fasteners and slide the bumper free.
After removing the bumper cover, it is important to wash it thoroughly with degreaser and water. This will ensure that any dirt, grease, or debris is removed from the surface before you begin the painting process. You can use hot water and a detergent designed for plastic, or a plastic surface cleaner, for this step. Be sure to dry the bumper cover thoroughly after washing, using a soft cloth or a heating method.
Once the bumper cover is clean and dry, you can begin the next steps of the repainting process, which include sanding, applying a base coat, and painting. However, before proceeding, it is important to identify the type of plastic your bumper is made of, as this will impact the products and processes you use for painting.
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Clean the bumper
To clean the bumper, start by removing the plastic bumper cover. You can do this by examining the bumper to find the connection points, which may be near the trunk latch, tail lights, or wheel wells, and are sometimes hidden beneath bumper fascia. Once you've found the connection points, remove any fasteners and slide the bumper free. Then, wash the bumper thoroughly with a plastic surface cleaner, degreaser, and water. You can also use soap and water. Make sure to get into any nooks and crannies with a sanding sponge. After washing the bumper, wipe it down with a clean cloth to dry it.
Once the bumper is clean and dry, you'll need to sand it. Start by wet sanding any rough spots with 600-grit sandpaper. This will help to smooth out the surface and prepare it for painting. After sanding, be sure to wipe away any remaining dust or debris with a clean cloth or air gun so that the bumper is completely clean before you begin the painting process.
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Sand the bumper
Sanding a bumper requires some knowledge and skill. If the paint and underlying substrates didn't adhere properly, they need to be removed without chewing into the bumper itself. Going too far can create "fuzzies", which are tough to get rid of without getting deeper into the process.
Firstly, make sure the bumper is free of any imperfections. If it isn't, fix them using body filler. When filling in damaged spots with filler, mix equal amounts of filler and hardener on a clean piece of cardboard. If you reach the plastic part during the sanding process, cover the bare areas that show the “live” plastic with a plastic adhesion promoter. This will enhance the putty’s adhesion to the bumper's surface.
Next, start sanding the black primer using 500-grit sandpaper. When you're done, use an abrasive pad and sand the fender once again, making sure you don't miss a spot. You can also use 600-grit sandpaper to wet sand any rough spots. If there are scratches, try to sand them out. You don't want to get crazy with it unless you have to. After sanding, clean the surface of the part thoroughly, using a plastic degreaser.
If you are planning to refinish the bumper with the flex agent added to the paint, all the paint will need to be removed. Primer is bonded to its base, the base coat or colour coat is bonded to the primer, and the clear coat is bonded to the colour. Anything that prevents a good bond will cause problems. Sand all the paint off by hand using a flexible sanding block with 180-220 grit until all the damage is gone. Spot prime the damaged area, then sand the entire bumper with 360-400 grit.
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Apply the paint
When it comes to applying the paint, there are a few methods you can use. Firstly, ensure the bumper is clean and dry. If you have used filler, sand the remaining excess filler to level and even the surface. Then, in partial repairs, sand the area to be painted, and in large repairs, sand the entire bumper. To do this, use a refining sandpaper like P320 or P400. In hard-to-reach places, use a sanding sponge. After sanding, clean the surface of the bumper thoroughly, using a plastic degreaser.
You can then start the painting process. Firstly, spray on a base coat layer. After the base coat dries for around 30 minutes, wet sand any new imperfections with a finer grit sandpaper (1500 grit). Wipe the bumper smooth. Repeat the process of painting, drying, then sanding 1-2 more times. Make sure to wipe the bumper with a clean tack cloth after sanding each new layer.
Once the paint has full, even coverage, apply 1 layer of clear coat to seal in the base coat. After drying for 20 minutes, apply a second layer of clear coat and let dry for another 20 minutes. The clear coat will protect the paint and give it a nice shine. Before reattaching the bumper, wait at least 6 hours for the paint to harden fully. If you can, leaving it for 24 hours will ensure maximum durability.
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Frequently asked questions
Start by removing the bumper cover and washing it thoroughly with degreaser and water.
Wet sand any rough spots with grit sandpaper.
Car manufacturers use different paint manufacturers, so there can be slight variations in colour shade under the same car colour code. To get an exact paint match, find the colour code for your car.
After cleaning and degreasing the surface, lightly sand the surface and then apply the paint.
Wait for at least 6 hours before reattaching the bumper cover to the car. The longer the paint dries, the more durable it will be, so waiting up to 24 hours is recommended.
