Norton Tufbak Waterproof Sand Paper Sheet 400 Grit 230 x 280mm Black SKU: 368090 MODEL: 66623320265 Error. try again later You've successfully joined the club $ 1 .98 each Mitre 10 Variants Water proof backing. Ultimate flexibility, advanced a-weight paper backing. Advanced, resin bond system. Features and benefits For metal or acrylic painted surfaces. Waterproof for wet and dry applications. Premium fine silicone carbide abrasive.