Provides a long-lasting bond to masonry. Weatherproof, maintains flexibility in extreme heat and freeze-thaw conditions. Paintable, sandable and stainable. Perfect for sealing cracks or gaps in concrete or masonry structures. Holds its grip in all types of weather. Looks like cured concrete. Seals out radon migration. Meets or exceeds Federal Specifications TT-S-00230C, Type II Class A; ASTM C-920, Type S, Grade NS, Class 25, use NT, M, and A.