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OSI caulking, sealants, and other adhesives are great for filling in cracks in your windows, doors, siding, and other structures to ensure a tight seal that will keep water out, and heat in. The RF140 Black Magic Roofing & Flashing Sealant is a sealant designed using a specialized synthetic rubber and select cuts of asphalts. OSI’s QUAD MAX Advanced Formula Window, Door & Siding is designed for superior performance on exterior window, door, siding, and trim applications.