Norton 04037 04037 5XUH 3X H&L SND DISC 180 is used for stripping paint and primers, blending, leveling, finishing, dimensioning, sanding of bare wood, metal, fiberglass and plastic. Sands primer and sealer. Ceramic alumina abrasive, P-graded. Fiber reinforced backing. Non-pigmented, water-based zinc stearate, open coat.