Bostik Tile-Mate Premium Thin Set Mortar is composed of select, proprietary chemicals, carefully graded aggregates and Portland cement. Tile-Mate Premium Thin Set Mortar is pre-blended and ready to use. It provides superior bond strengths, excellent durability and outstanding workability. Tile-Mate Premium Thin Set Mortar is for interior or exterior applications to set all types of ceramic, porcelain, granite, slate, marble, limestone, and dimension stone tiles. Use over properly prepared concrete; structurally sound, exterior grade plywood (interior/dry use only); cementitious backer board; Bostik Ultra-Set Advanced; and existing, well-bonded vinyl/VCT or ceramic tile.