Using a scraper, wire brush, or 80 to 100-grit sandpaper, remove any loose or peeling paint from the damaged area. Remove any dust or debris from the area with a lightly water-dampened rag.
Using a putty knife, apply a thin layer of patching material to the damaged area. Allow it to dry.
Use 220-grit sandpaper to smooth the patched area and make it even with the surface.
Remove any final dust or debris from the finished repair.