It prevents moisture and contaminants from entering the grout and under the tiles.

Grout sealer also slows mold and mildew growth.Learn how to seal grout in just a few easy steps.

Seal the tile grout between every six months to a year.

Closeup of gloved hand applying grout sealer

The Spruce / Jason Donnelly

Sometimes, you could wait two to three years to seal the grout.

Wait until the tile grout is fully cured and dry before applying the grout sealer.

Any moisture in the grout will prevent the grout sealer from soaking in.

Overhead view of materials to seal grout

The Spruce / Jason Donnelly

Scrape out cracked grout and fill with replacement grout.

Beforefixing older grout, be sure toclean the groutand let it completely dry before sealing.

Cover the grout lines uniformly.

Cleaning and drying grout before sealing it

The Spruce / Jason Donnelly

Add a Second Coat

Apply a second coat based on the package instructions.

When buying grout sealer, do not confuse it withtilesealer.

Grout sealer protects grout, and tile sealer protects the face of the tile.

Above view of applying grout sealer with a sponge applicator

The Spruce / Jason Donnelly

But for the sake of convenience, you may want to use a spray grout sealer.

Though some sealer will end up on the glazed surface, it should wear off over time.

This is especially the case with spray-on grout sealers, which are more difficult to control.

Wiping down the tile after sealing the grout

The Spruce / Jason Donnelly

How Topical and Penetrating Sealers Protect Your Tile and Stone.Ceramic Tile Education Foundation.

Adding a second coat of grout sealer

The Spruce / Jason Donnelly

Testing the grout sealer to see if it has dried yet

The Spruce / Jason Donnelly