This is a one component , Oil-based sealant that offers excellent & permanent adhesion with outstanding durability for general sealing jobs in roofing, metal sheet, external walls, roofing tiles etc. The surface of this AWNING & ROOFING CAULK will skin and dry, but the underneath will remain flexible, soft and paste-like to allow some expansions & contractions under direct sunlight heating without hairline cracks lateron. Best performance for roofing leaking works. Features - - Permanently flexible - Low Shrinkage & Non-Sagging - 100% Weather-proof & Water-proof