3M Pro-Pak Wetordry sanding sheets can be used with water to reduce clogging and extend abrasive life. Features silicon carbide, a sharp, synthetic material that cuts fast and smooth. Use to sand between coats of paint, varnish or other finish. 3M Pro-Pak wet or dry abrasives are specially designed for wet or dry sanding. Use 3M imperial Wetordry sandpaper for a premiere finish on lacquers, primers, sealers, plastics and paints. For final or between coats sanding.