Grout should only be applied to clean, dry tiles. Use an upward motion to spread grout across tiles. Grout should first be applied at a 45-degree angle and then with a back-and-forth motion until it is evenly distributed between tiles. Grout should then be left to set for 15 minutes.
Once the grout has begun to cure, the remaining excess grout must be removed. Using a dry paper towel, wipe the surface of the tiles, until it is clean. Any grout left to dry on tiles will not be removable once it is set. Use dry paper towels (and lots of ‘em!) to work off the grout residue. Grout should then be left to cure for 2-3 days (or more depending on the installation). During this period, avoid walking on or applying excess pressure to tiles. If they must be walked on before the grout is fully cured, lay a piece of plywood over tiles to lessen the impact.
See Glass Tile Installation Methods for more information.
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