BOSS - 370 HVAC Silicone is a one-part acetoxy cure adhesive sealant that is suitable for general heating, ventilation and air conditioning sealing and adhesive applications. This product will adhere to clean metal, glass, many types of wood, silicone resins,vulcanized silicone rubber, ceramics and plastic surfaces. A primer may be required for optimum adhesion to some substrates. • Seal heating, ventilating or air conditioning duct work • Seal cracks or gaps around windows, vents, ducts, fixtures and lights • Seal leaks in gutters, downspouts, ducts and piping • Seal electrical connections and boxes to waterproof • Bond gaskets in heating and refrigeration units Applications: Adhesive Sealant For General Heating, Ventilation And Air Conditioning Applications. Adheres To Clean Metal, Glass, Many Types Of Wood, Silicone Resins, Vulcanized Silicone Rubber, Ceramics And Plastic Surfaces.