Bostik Dimension grout in Opal has created a glass-filled, ready to use, water-based urethane grout. This grout contains micro glass beads and translucent urethane binder that reflects light and allows it to illuminate the tiles directly. Bostik Dimension offers limitless design possibilities with its capabilities to be used on ceramic, porcelain, glass, metal, and natural stone tiles on floors and walls, interior and exterior. Bostik has delivered a grout that is stain proof, LEED compliant, chemical and mildew resistant, UV stable, and resistant to cracks. It has a 3 hour working time, and is easy to install. Dimension grout will not fade, streak, or change shade even when wet! This product is also available in 18 lb buckets.