Glass Mosaic Tile thin set is the ultimate one step polymer fortified thin set mortar specifically designed for outdoor and wet environments. GMT provides superior adhesion to glass, mosaic tiles, porcelain, ceramic, and natural stone. Its' unparalleled proprietary formulation makes it the perfect choice for setting tile in swimming pools, spas, water features and other areas with submerged applications. GMT produces a ultra-white finish that will enhance the look of glass, mosaic tiles and any translucent tile or stone. For use in both commercial and residential applications.