OSI GS121 Gutter Caulk Sealant (In Stock Now)

OSI GS121 Gutter Caulk Sealant is the professionals choice for tough, reliable sealing in exterior applications. Made from high-quality resins and polymers, this OSI gutter sealant forms a durable, rubbery gasket that is ideal for sealing seams, joints, and cracks in aluminum, galvanized, and vinyl gutters and downspouts. It is also suitable for use on sheet metal, air conditioning and heating ducts, and ventilators. OSI GS121 gutter sealer remains permanently flexible, expanding and contracting with changing weather and temperatures without cracking. This versatile gutter caulk provides lasting protection against the elements and is designed to withstand harsh outdoor conditions. For best results, avoid tooling, feathering, or smearing the caulk. While effective for exterior use, it is not suitable for copper surfaces or interior applications in occupied structures.