3M Wetordry 99420NA Sandpaper, 11 in L, 9 in W, Fine, 400 Grit, Silicon Carbide Abrasive, Paper Backing

The 3M Wetordry Tri-M-ite sheet, 413Q, is a silicon carbide, closed coat product bonded with a waterproof resin. It can be used wet or dry for sanding old finishes, fine featheredging, surface work or last final sanding step before priming.