OB1 is a professional-grade, multi-surface construction sealant and adhesive designed for contractors and DIY users who need strong, reliable performance in one universal solution. Proudly made in the USA, this advanced hybrid sealant and adhesive can be applied to wet, damp, or dry surfaces and is paintable in just one hour, helping projects move faster from installation to finish. As a high-performance waterproof sealant, OB1 is ideal for windows, doors, siding, roofs, gutters, shower surrounds, countertops, column joints, brick molding, and other interior and exterior sealing applications, creating flexible, crack-resistant, long-lasting seals. As a heavy-duty construction adhesive, OB1 delivers superior bond strength to wood, metal, concrete, stone, tile, plastic, PVC, drywall, gypsum board, vinyl, glass, trim molding, foam board, and more, making it a true all-purpose adhesive for building, repair, and remodeling projects. The 100% waterproof, weather-resistant hybrid polymer formula withstands moisture, extreme temperatures, and outdoor exposure, while its low-VOC, low-odor formulation ensures safe use in homes, kitchens, bathrooms, and job sites. Backed by over 20 years of OB1 performance and the innovation of Bostik, a global adhesive leader founded in 1889, OB1 delivers the strength, flexibility, and durability professionals trust in a universal sealant and adhesive solution.