Seal grout by applying a commercial grout sealer and using the roller or brush applicator included with the product. For new tiles, wait until the grout has completely cured before applying the sealer. Clean and repair older grout before applying sealer.Continue Reading
If the tile is newly installed, let the grout cure for at least 48 hours before applying sealer. For older tiles, scrub the grout, and let it dry. Repair any chips or cracks with a grout filler.
Commercial grout sealers come with a brush or roller to apply the product. Carefully paint the sealer on the grout lines with the provided tool.
Wait five minutes for the sealer to penetrate the grout. If the humidity is high, wait up to 15 minutes.
Inspect the grout for dry areas where sealer did not apply. If necessary, touch these areas up. If there are many dry areas, apply a second coat to all of the grout.
Wipe off any grout sealer that gets on the tiles with a soft cotton cloth. Use a plastic scrub pad on stubborn areas.
If the sealer is on the floor, wait two hours before walking on it. Avoid getting the area wet for 24 hours.