Custom® VBFW50 VersaBond Flex® Fortified Thin­-Set Mortar, 50 lb, WhiteA professional formula, all purpose mortar with high flexibility and bond strength. With outstanding adhesion to plywood subfloors, this mortar can also be used for porcelain and glass tile installations. Use it for interior or exterior floors, countertops and walls. 50 LB Bag White High bond strength and flexibility Excellent for setting porcelain and glass tile Exceptional adhesion to plywood subfloors. Suitable Tile Types: Vitreous, semi vitreous