Design FX® Grout is a ready to use grout that 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 1/18" 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*, approved for interior and exterior use, can be immersed in water applications such as swimming pools and is rated up to moderate commercial use.