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Step 4. After the tile adhesive has cured, clean out the grout joints between all the tiles using a soft broom or a shop vac. Then mix the grout, and spread it into the joints using a float tool. Make sure the grout fills all the joints.

Step 5. To remove the excess grout, drag the rubber float across the joints at a 45 angle. Do not press too hard because this can pull grout out of the joint and require you to apply a second coat.

Step 6. Clean off any remaining grout with a sponge and clean water. Work in a circular motion, and clean the sponge frequently. Also change the water as soon as it becomes completely cloudy. When the tiles are as clean as you can make them, let the surface dry. Then buff the tiles using a clean, soft cloth.

Step 7. Seal unglazed tiles and grout with a transparent sealer. Use a roller to apply it, according to the manufacturer’s instructions printed on the product container. Diagonal strokes force the sealer into the grout joints better. If your tiles are glazed, apply sealer only to the grout with a brush.