The new Pro-Grout Excel in whisper grey from Superior Adhesive & Chemical gives your floor and wall tile projects professional polish. The stain-resistant formula is fast setting and never needs to be sealed. Suitable for both indoor and outdoor use, this tile grout resists cracking and shrinking and can be used to fill grout joints ranging from 1/16" to 1/2". Use caution when using this grout on polished stone.