A versatile, all-purpose duct sealant for use on all types of metal duct, fiberglass duct board, duct fabric, and flex duct. CCWI-181 incorporates a built-in polyester reinforcement for exceptional strength and UV inhibitors for outdoor use.

Water-based, heavy texture, fiber-reinforced, UL 181A-M and B-M, up to 16" w.c., mold/mildrew properties, excellent UV resistance.CCW-181 White Fiber - 11oz Cartridges Hardcast