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.The 3M Wetordry Abrasive Sheet 413Q is best suited for metal sanding and finishing thanks to its versatility and fast cutting abrasive material. Its flexible, A-weight paper backing provides smooth operation and durability and can conform to the shape of contoured parts for consistent finishing.