Sunmight  9" x 11" Waterproof Sanding Sheets 50Pcs P400-P2000Sunmight Waterproof is made with quality water-resistant paper backing for flexibility and outstanding finish. Sunmight Gold is a premium paper product made with high quality grain, latex paper and strong resin. This provides better performance and longer life. Special resin technology reduces possible curling problem during wet sanding operations.