Henkel Consumer Adhesives 1056584 "Osi - Pro-series" Aluminum Gutter Sealant 7 OZ. "OSI - PRO-SERIES"GUTTER SEALERS For sealing around aluminum, galvanized and vinyl gutters and downspouts. Sealing seams, joints and cracks in gutter troughs. Withstands moderate expansion-contraction cycles. Air cures into a tough, rubbery seal.