Seal-Fast Liqui-Flash polyurethane roofing sealant seals complex details quickly and permanently. The product provides excellent adhesion, elongation and tensile strength. It can be used in typical and difficult-to-access applications, including flashings, skylights, pitch pockets (filling and sealing), inlaid gutters, air conditioners, brick ties, roof vents, penetrations, ductwork, roof hatches, chimneys and seams. It is compatible with a wide range of substrates, including metal, polyurethane foam, aged smooth asphalt, aged modified bitumen, aged PVC and aged EPDM.