Design FX® Grout is ready-to-use and accentuates the natural beauty of glass, mosaic and metal tiles in addition to ceramic, porcelain and most natural stone tile. For use in tile joints from 1⁄16" to 1⁄2" (1.6-12 mm) on floors and 1⁄16" to 1⁄4" (1.6-6 mm) on walls. Design FX grout is stain proof*, can be used in intermittent wet locations and is rated up to moderate commercial use.