Acrylic Latex Duct Sealant is a gray, water-based duct sealant used in medium and high pressure duct systems. Special formulation is non-flammable and provides permanent flexibility, excellent water resistance and superior sealing strength. Used to seal metal to metal joints to prevent air leaks in spiral and rectangular duct work for air conditioning, refrigeration, ventilation and air distribution. May also be used to seal joints on run outs of connecting metal flexible tubing. Mold and mildew resistant.