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Unsanded grout is smooth and used for joints less than 1/8" wide, typically for wall tiles. Sanded grout has fine sand added for strength and is used for joints 1/8" or wider, typically for floor tiles.

Sanded grout should be sealed to prevent staining and moisture absorption. Apply sealer after grout has cured (typically 48-72 hours). Epoxy grout does not need sealing.

Allow grout to cure for 48-72 hours before sealing. In humid conditions, wait up to 7 days. The grout should be completely dry and uniform in color before applying sealer.