The 1/2 gal. Duct Sealant is a water-based, fiber-reinforced mastic designed to create durable, airtight seals on HVAC ductwork. Ideal for sealing metal duct joints, seams, and connections, this sealant helps reduce air leaks, improve system efficiency, and meet residential and commercial HVAC sealing requirements.

• 1/2-gallon container is ideal for small to medium HVAC sealing projects
• Water-based, fiber-reinforced formula provides a durable, flexible seal
• Seals duct joints, seams, connections, and penetrations to reduce air leakage