ProMender Flex is a rapid curing, high strength polyurethane crack and spall repair material. ProMender Flex is a shaveable crack repair material. The material has an initial cure of 45 minutes that is followed by a 2-3 hour window that it can be shaved flush with the surface. This allows the material to be used in situations where grinding is not possible, such as a polished concrete floor. ProMender Flex may be pumped through any of the Hi-Tech SB Line of pumps for larger projects where hand grinding is not practical or feasible.