Water-Based Sealant

United Duct Sealer™ (Water Based) is specially formatted for sealing low-, medium-, and high-pressure duct systems. It is recommended for indoor and outdoor applications. It provides excellent adhesion to galvanized metal and cures to a tough, durable film. This water based sealant is free of VOC's and meets LEED V4 requirements. It is non-flammable wet and dry and is UL Listed.

Available 1- and 5-gallon pails

United Duct Sealer™ (WB) Safety information


Uni-Mastic™ 181 Duct Sealer is specially formulated for sealing low-,medium-,and high-pressure duct systems. It is recommended for indoor and outdoor application. It provides excellent adhesion to galvanized metal and cures to a tough, durable film. This water based sealant is free of VOC’s and meets LEED V4 requirements. It is non-flammable wet and dry. UL Listed.

Available 1- and 5-gallon pails

Uni-Mastic™ 181 Duct Sealer Safety information


Uni-Extreme™ High Temperature Sealeris a one-part sealant that can withstand extreme temperatures of -320°F to +2400°F continuous (3100°F intermittent) while maintaining a sure seal. Excellent adhesion makes it resistant to most chemicals, solvents, and electricity. Its ability to form gaskets makes it ideal for sealing a variety of applications including clean metal, stacks, flues, exhaust systems, engines, turbines, fire bricks, mortar, and ceramic surfaces.

Available in 10.5 fluid oz tubes.

Uni-Extreme™ High Temp. Sealer Safety information