Polyurethane construction adhesive is a 1 component fast-curing, flexible material which provides a durable elastic bond. High performance construction grade adhesive permanently bonds concrete, brick, marble, stone, wood, glass, aluminum, steel, PVC, and tile. Uses include repairing broken concrete, bonding retaining wall block and caps, or fastening wood panels to drywall, concrete, or masonry. Standard caulk gun use. Tack-free in approximately 90 minutes, and fully cured in 5 to 8 days.