Bostik Dimension StarGlass Grout 720 Copper 9 lbs Premixed sanded urethane grout; Easy to install for DIY or contractor use Delivers a unique reflective appearance; Offers limitless design possibilities New RapidCure formula; Expose to water after only 3 days. Chemical and mildew resistant; Contains Bostik's blockade antimicrobial protection Flexible properties; Resistant to cracks and shrinkage