DUCT SEALANT is a fire-resistive, vibrated,water-based, indoor/outdoor vapor barrier sealant for low, edium and high-velocity heating and air conditioning ducts. It performs as atough and flexible adhesive and sealant, forming a durable seal against air leakage when used with or without reinforcing tape ormembrane. Mechanical fasteners of the type and number normally used for duct assemblies are required to provide rigidity to the duct system.SAFETEE DUCT SEALANT has excellent weather resistance, low water vapor permeance and good water resistance, allowing it to be used outdoors and in high humidity environments. It is U.V. resistant.When dry, it may be painted with good quality, water-based paint.