Discover the First Line of Defense Against the Elements. Simply put, OSI QUAD MAX siding & window sealant delivers the toughness that really makes a job last. QUAD MAX is the next generation of siding and window sealants, providing maximum durability and superior application performance for use in any condition. Recommended For the Pros, by the Pros QUAD MAX siding & window sealant is designed for sealing around interior/exterior windows, doors and siding. It bonds to a wide variety of materials without need for a primer such as fiber cement, cedar, brick, stone, coated aluminum, fiberglass, vinyl, PVC, stucco, EIFS, wood, glass, and flashing tapes and Kynar coatings. Due to individual screen limitations, colors shown here may not accurately reflect OSI Quad Sealant colors. Due to individual screen limitations, colors shown here may not accurately reflect OSI Quad Sealant colors.