A product for interior & exterior, commercial or residential installations to set all types of porcelain, saltillo, ceramic, granite, slate, marble, limestone, and dimensional stone tiles. Formulated to prevent large-bodied ceramic, porcelain, and stone tiles from slipping in vertical applications—and also suitable for installing floor tiles. For usage over properly prepared concrete; structurally-sound, exterior grade plywood ( interior / dry use only ); cementitious backer board; Bostik Ultra-Set Advanced, Bostik Black-Top, Bostik GoldPlus; existing well-bonded vinyl composition tile ( VCT ) or ceramic tile; and cutback adhesive residue ( dry only ).