Bostik Dimension RapidCure Silver Glass-Filled, Pre-Mixed, Urethane Grout is a patented, water-based formula that contains reflective micro-glass beads, and a translucent urethane binder. Dimensions reflects light and allows it to pass through grout joints and into the tile itself. This creates a unique reflective appearance in all tile installations but the three-dimensional effect when used on glass installations is particularly captivating. This pre-mixed grout offers unmatched toughness as well as water and stain resistance.