How to Remove a Dent in Your Plastic Bumper

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    • 1). Sand in the dent and up to 3 inches around it with 220-grit sandpaper. Remove all of the paint from the surface, down to the primer or plastic surface of the bumper.

    • 2). Use 380-grit sandpaper to sand the area again. Smooth the sanded area with the 380-grit sandpaper so that it isn't as rough as the finish left by the 220-grit sandpaper.

    • 3). Mix the body filler and hardener on a palette such as a piece of cardboard. Use enough filler to fill the dent twice. Add a small amount of hardener and mix the two with a plastic squeegee. Squirt a thick, one-inch line of hardener out of the tube for every golf ball sized amount of filler. If the filler amounts to three golf balls, use a three-inch line of hardner. Mix until the filler is a solid color with no swirls left by the hardener.

    • 4). Wipe the filler over the dent with the squeegee. Fill the dent with filler and spread the filler out to cover most of the area that you sanded. Let the filler dry for an hour.

    • 5). Sand the filler with 220-grit sandpaper on a sanding block until the filler is smooth and level with the surrounding surface of the bumper. Keep the sanding block flat against the surface of the bumper and lead with a long edge of the block, even if the dent is on a corner or edge. Follow the body lines of the bumper.

    • 6). Go over the filler with 380-grit sandpaper on the sanding block to smooth the scratches left by the 220-grit sandpaper. Wipe the area with wax-and-grease remover and a microfiber towel. Place masking tape and paper around the repair so you won't get overspray from paint and primer on the surrounding area of the bumper.

    • 7). Spray primer over the areas with filler. Let the primer dry for 30 minutes. Spray a total of three coats of paint over the dried primer. Hold the sprayer 12 inches from the surface and move left and right, not up and down. Let each coat dry for 10 minutes before spraying the next coat. Let the final coat dry for four to six hours before handling it.

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