5 Pack, 9-Inch x 11-Inch, Assorted Grits, Wet Or Dry, Waterproof Silicone Carbide Sandpaper, The standard for Wet-or-Dry sandpaper, this paper utilizes a silicon carbide abrasive bonded with a waterproof resin to an improved paper backing, resulting in an improved rate of cut, increased abrasive life, increased flexibility, and a uniform, consistent finish. Uses include sanding new surfaces, burnishing old finishes, and feathering fine edges. Ideal for sanding metal for repainting or prior to primer coat.