SGM UGAK103 50 lb Gray Multi-Crete Thin-Set Mortar commercial latex-Portland cement mortar offers economy as an all-purpose bonding mortar formulated for the installation of ceramic, mosaic, quarry tiles and dimension stone (absorptive, semi-vitreous and vitreous) tiles. It may be used for either floors or walls in both interior or exterior applications where a latex-Portland cement mortar is required. Redispersible powder additives are used to improve adhesion, provide greater bond strength and resistance to impact and shock. These additives allow for some latitude in time, working conditions and temperature. Do not use to install resin-backed stone.