Stone Edge Surfaces CPR-Concrete Patch and Repair® is a multi-use, just add water, high-performance, fast 15 to 30-minute set time, 10,000 psi, no-shrink, non-cracking, polymerized Hydraulic & Portland cement based concrete patch, repair and refurbishment material. CPR is for general and structural industrial, commercial, and residential VOH patching and repairing, and can also be shaped and formed to rebuild and refurbish curbs, steps, stairs pillars, walls, concrete tanks, and more. CPR has superior bonding strength, does NOT require a primer before application or “water curing” after application, only gets warm to the touch not hot, and can be applied from ¼” to 6″ thick without cracking.