OB1 Multi-Surface Construction Sealant & Adhesive for bonding and sealing metal, plastics, mirror, polystyrene, fibreglass and wood. This beige sealant and adhesive has a hybrid polymer formulation, which means it can be applied under water. It acts as a structural underwater bond in closed-face applications in swimming pools such as floor and wall tiles without the need to drain the pool. OB1 Multi-Surface Construction Sealant & Adhesive maintains a robust bond when cured from -40 to +120Callowing it to cope in harsh external weather conditions and in refrigeration environments. The OB1(r) Hybrid Sealant Adhesive Terracotta 290ml.The Bostik OB1(r) Hybrid Sealant Adhesive has a user-friendly, hybrid polymer formulation. An alternative to mastics, wood and PU adhesives, silicones, acrylics and butyl rubber sealants. Contains no solvents so will never crack or shrink. Can be applied on wet surfaces, painted or moulded. Very high bond strength with resistance to fungal and bacterial growth. The Bostik OB1 Hybrid Sealant & Adhesive has a user-friendly, hybrid polymer formulation. An alternative to mastics, wood and PU adhesives, silicones, acrylics and butyl rubber sealants. Contains no solvents so will never crack or shrink. Can be applied on wet surfaces, painted or moulded. Very high bond strength with resistance to fungal and bacterial growth.