OSI® GS-121™ Gutter & Seam Sealant is composed of SBR rubber and high quality resins, which cures to form a tough, rubbery seal that expands and contracts with the change of weather without cracking. Formulated especially for sealing aluminum, galvanized and vinyl clad gutters and downspouts.
Sealing around aluminum, galvanized and vinyl clad gutters and downspouts. Excellent for sheet metal work, ducts and ventilation joints. Sealing seams, joints and cracks in gutter troughs.
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