About Master Flow™ Duct Mastic/Sealant

Master Flow ™ Water Based Air Duct Sealant helps seal all types of air ducts, air duct plenums, takeoffs, elbows, and vent boots to reduce the risk of conditioned air leakage. The sealant is fiber reinforced and easy to apply by brush, gloved hand, or putty knife to flex duct, duct board, and sheet metal air ducts. It dries to a tough, flexible, seal. It adheres to many surfaces like: drywall, foam and fiberglass insulation, galvanized steel, aluminum, masonry, and wood. This product is also available in 10.5 oz. caulk tubes and half gallon tubs.

  Weight Carton Quantity


12.75 lb. (5.78 kg) 12
WBA50 TUB 45.6 lb. (20.68 kg) 8

Features & Benefits

Product Documentation