Alliance’s Gator Block Bond XP Low VOC is one of the strongest polyurethane adhesives on the market. It is specially formulated for overlays, pool copings, steps and wall caps, concrete pavers, wet cast, natural stones, retaining walls, masonry units and bricks. Gator Block Bond XP Low VOC Polyurethane Adhesive is formulated to provide a permanent bond in 24 hours to the above materials if properly installed.