BOSS® 125 Multi-Seal® construction sealant is a multipurpose, one part sealant, formulated with USP™ Technology. This unique sealant is free from solvents and isocyanates. It cures on exposure to atmospheric moisture to form a highly durable flexible sealant. BOSS® 125 Multi-Seal® has been formulated to offer outstanding primerless adhesion to most common building materials including vinyl, aluminum, steel, concrete, wood and glass. It can be applied and tooled under most weather conditions.