Bostik TruColor Rapidcure Pre-mixed Grout is a patented, water-based, urethane grout offering the ultimate in color accuracy, stain protection and crack resistance for residential and commercial tile installations. This breakthrough formulation installs up to 50% faster than traditional grouts, and never needs to be sealed. Its perfect balance of flexibility unmatched performance and crack resistance. TruColor exceeds the grout-relevant portion of the ANSI 118.3 epoxy standard (modified ANSI 118.3 -UG). Perfect color every time.