QEP® 3.5 Gallon Ceramic Tile Adhesive Is A High Performance, Ready To Use, Type I Mastic For Installing Ceramic, Porcelain, Natural Stone, Quarry And Mosaic Tile On Floors And Walls. It May Be Used For Countertop, Backsplash And Shower Wall Installations, Too. 5900 Spreads Effortlessly, Sets Quickly And Is Easy To Clean Up.