3M Wetordry Sandpaper Sheets 32035 are waterproof for wet sanding. Excellent for sanding primed surfaces, removing orange peel, dust nibs and light sagging of the top coat. Used on metal, plastic body filler and fiberglass surfaces. Designed for hand sanding, each 9" x 11" sheet can be cut to the size of your sanding block. During Stage 4 of the 3M Body Repair System use 800 grit sandpaper to scuff the blend area prior to applying base coat paint. Scuffing the blend area is the light sanding process on the old, existing clear coat needed for the newly applied base coat paint to stick. The blend area is the area around the dent or repair area that transitions from bare metal to primer, to the old base coat, to the old clear coat. 800 grit sandpaper used to scuff the blend area prior to applying base coat paint Can be used wet or dry Contains 5 sheets of 9" x11" sandpaper