OSI GS121 Gutter & Seam Sealant is the tough, professional choice to get the job done well. Composed of high quality resins and polymers for a tough, rubbery gasket, OSI GS121 Gutter & Seam Sealant is designed for aluminum, galvanized and vinyl gutters and downspouts, sealing seam, joints and cracks in gutter troughs, and for use on sheet metal, air conditioning and heating ducts and ventilators. This seal is permanently flexible and expands and contracts with weather and temperature changing without cracking. For best results do not tool, feather or smear sealant. Not suitable for use on copper, and not recommended for interior use in occupied structures or as an expansion joint control sealant. OSI offers an arsenal of adhesives, caulks, and outdoor construction sealants for the true professional. OSI: Tougher Than the Elements.

• Seals gutters
• permanently flexible
• tough, rubbery seal
• versatile
• professionals choice

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