Per the on-screen captions, a 320-grit piece of sandpaper should then be followed by a 400-grit piece of sandpaper. Then, with soap and water used intermittently on the headlight, there’s a ...

For most types of wood, this is the finest grit you'll need. Wood with a very dense grain, like ebony, may require one additional sanding step with 320- or 400-grit paper to eliminate visible ...