Variations include: Abrasive material used; Type of backing; Format (sheet, belt or disk) for specific sanding machines. Grit is one of the most important variables. Perhaps more any other ...

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 ...