Bostik DUO-SIL Ultra is specifically designed to meet the needs of the professional contractor. It is a superior, all-purpose adhesive and sealant combining enhanced ease of application with longterm performance. DUO-SIL Ultra® as a sealant can be used to fill butt joints in vinyl, aluminum and concrete siding, windows, doors, column joints, gutters, roofs, brick molding, counter tops, showers and most areas where a sealant is needed. DUO-SIL Ultra® as an adhesive has superior bond to most building substrates and will adhere to wood, metal, gypsum board, vinyl board, cove base, molding, foam board and many more building products. DUO-SIL Ultra® as an adhesive and caulking compound will not degrade Polystyrene foam bead board the way most solvent based or plasticized sealants do. DUO-SIL Ultra® meets or exceeds the standard specification for latex sealants ASTM C920, Type S, Grade NS, Class 50. DUO-SIL Ultra® complies with the specification requirements of AAMA 803.3-10 Type I. Best of all, it is MADE IN THE USA!