Using Tips
60 to 220 grit: for rough sanding and removing scratch.
320 to 400 grit: for light sanding between coats of finish, or to sand metal and other hard surfaces.
600 to 800 grit: for final finishing before painting.
1000 to 1500 grit: for sanding between coats.
2000 to 3000 grit: for buffing.