Bostik Dimension RapidCure Glass-Filled, Pre-Mixed, Urethane Grout is a patented, water based formula that contains reflective, micro-glass beads, and a translucent, urethane binder that reflect light and allow it to pass through grout joints and into the tile itself. This creates a variety of aesthetic effects in virtually all tile options available today. It may add an elegant sparkle and/or blend naturally with traditional tile and stone. It also creates a unique three dimensional effect within clear glass tile installations.