Spall RX2 is a rapid set, high strength ultra low viscosity polyurethane concrete repair material. This two component, 1:1 system is designed to repair cracks, spalls and other concrete surface defects. It has an ultra low viscosity, similar to water which allows the material to penetrate ultra fine cracks. Cracks and spalls may also be pre filled with silica sand and saturated with RX2 to refusal. Spall RX2 has additional working time when compared to RX, but still cures in about 30 minutes and may be ground and polished immediately.