Next, sand the area with an electric drill that has a sanding disc or wire brush, and remove all the paint from the dented area. Use a plastic spatula to apply filler to the dent and then let it harden. After the filler is solid, reshape the surface using a rasp, moving to sandpaper first with a coarse grain then use fine grained sandpaper. Before going any further, you'll want to use your fingertips to inspect the area for any imperfections; fill the bumps with cellulose stopper and give it a final rubdown with fine sandpaper.
When you are ready to paint the area, cover all of the surrounding areas with masking tape and newspapers or brown paper bags. First spray an aerosol primer onto the area, standing about eight inches away and moving the can back and forth. Start with a thin coat and then apply two more coats, rubbing it over with fine sandpaper when it's dried completely. The top coat comes next. Spray from the top to bottom in horizontal lines, two coats, and use the same steps you did with the primer. Apply two more additional coats, letting the area dry completely and then use fine sandpaper to rub down the area. Finally, apply the final coat about an hour later.
