Norton SandWet 320 Grit Aluminum Oxide Waterproof Sandpaper provides a fast cut rate and a smooth, consistent result. Ideal in wet, oil, or dry sanding applications of varnish, enamel, primer, lacquer, and sealers, the cut sheet resists curling when exposed to humidity for enhanced longevity. This paper waterproof sheet offers an excellent option for sanding and finishing hard and soft woods.