This product comes with 4 different grits of waterproof sandpaper. To be used for automobile paints, clear coats, varnish, porcelain, Corain, fiberglass and metal. Sanding Blocks, Boards & Bushing Tools Automotive. It is suitable for achieving a fine finish on a range of hard surfaces. Use this sandpaper for smoothing various tough surfaces. Made of silicon carbide, this sandpaper is perfect for wet sand situations and offers extra fine finishing.