Bumper repairs can be expensive. While your plastic bumpers are specifically designed to bear common scratches and dents caused by accidents, you will never know when more serious damage may occur. Instead of bringing your car's plastic bumper to a specialist, you can fix a plastic bumper that's cracked or in need of paint.
Scuff the plastic bumper's damaged area using 80-grit sandpaper. Scrape the sandpaper across the bumper from every side. Doing this will allow your repair paint to adhere to the damaged area or surface more easily.
Put on the plastic gloves and pour a very small amount of plastic prep solvent onto the rag. Clean newly-scuffed bumper area by wiping your rag across it. Wipe the area in one direction only.
Mix the repair adhesive and hardener together on a section of the cardboard.
Spread the hardener and the repair adhesive mixture across the damaged area of the bumper. Use the squeegee to equally distribute the hardener and adhesive. Leave this to dry for at least 20 minutes.
Use the second squeegee to apply a thin coat of the plastic filler over the damaged area. Do not apply a very thick layer of the filler, or you may have a hard time sanding it off.
Smooth the area with the 80-grit sandpaper as soon as it has dried completely.
Pour the paint into the paint sprayer and use this to apply two to three coats of paint on the bumper area for repair. Let the paint dry for at least 24 hours.