Grinding and Sharpening: In metalworking, sandpaper may be used for grinding and sharpening several metallic resources and surfaces. Coarser grits, like 36 or 60, are used to get rid of material and condition the metallic. This is very helpful for reshaping or sharpening blades, chisels, or other cutting instruments. Sandpaper https://www.quora.com/profile/Trevor-Flatcher-2/Application-and-Development-of-Silicon-Carbide-in-Bulletproof-Ceramics-Silicon-Carbide-in-Bulletproof-Ceramics-Applica