S30 Polyurethane Roof & Flashing sealant is a premium quality, commercial grade sealant developed especially for forming permanent, water and weatherproof seals in all exterior gaps and joints. This sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original seal. It provides properties of non-sag, permanent flexibility, and corrosion resistance. It exhibits outstanding durability and tear resistance. It usually requires no primer and resists deterioration from weather, stress or movement. It is UV and ozone resistant and does not soften in the sun. Recommended for: Bonding to asphalt, aluminum, fiberglass, metal, brick, wood concrete, stucco, and many more substrates; Sealing roof flashing around chimneys and roof edging; and Shingle tabbing and for covering roofing nails. Low VOC (Volital Organic Compound) formula.