The key to any good paint job starts with the prep work, which usually means sandpaper.
Most sandpaper can be used on a variety of surfaces, like metal, wood or plastic, and it's measured in grit. The lower the grit, the coarser the sandpaper.
You'll probably be able to get away with just holding the sandpaper while working on your car, but a sanding block can help if you're working on a flat surface. Safety is also important to remember; be sure to have goggles and a dust mask handy.
Check out more in the "Driver's Ed" segment above.