3M™ Scotch-Weld™ Concrete Repair DP600 is a quick-curing, two-component polyurethane adhesive designed to repair cracks, spalls and breaks in concrete, masonry and stone. The rapid setting concrete hardens in as little as five minutes, eliminating down time without lengthy disruptions to day-to-day services. In fifteen minutes the adhesive is firm enough that you can drive a forklift over it.