OB1 Multi-Surface Construction Sealant & Adhesive for bonding and sealing metal, plastics, mirror, polystyrene, fibreglass and wood. This anthracite 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 +120°C allowing it to cope in harsh external weather conditions and in refrigeration environments.