Keep your tiles looking great: How to seal shower grout

Grout sealers can be divided into two main categories: penetrating sealer and surface (or membrane-forming) sealers. A penetrating sealer will soak into the grout, providing better moisture protection. Surface sealers will still form a barrier against dirt and moisture, but they stay on the surface of the grout. They are better suited to dry areas or places that are only occasionally subject to water and wear.

When choosing a grout sealer, you will have several application choices: spray-on, brush-on, using a small roller, and, in some cases, directly from the container. Whichever method you choose, to best seal shower grout, you will first need to do a little prep work. This is covered in our step-by-step directions below.

If you have just finished installing new tile, make sure the grout is fully cured. Existing grout must be thoroughly cleaned before sealing. Use a commercial grout cleaner or soap and water and a small, stiff-bristled brush. Here are a few tips for situations you may encounter:

• Stains in the grout can often be removed by cleaning with vinegar and water. A 50/50 mix is a good starting point. 
• Replace any missing or loose grout with fresh grout of the same colour. 
• Before you begin sealing the grout, tape off all items that may come into contact with the sealer. This is especially important when applying a spray sealer.

How to seal shower tile grout:

1. Apply an even coat of sealer along each grout line. Try to work consistently from one side to the other to ensure no lines are missed. Always read and follow the manufacturer’s directions.
2. Wipe away excess sealer with a clean cloth as you progress. Most products will dry in about 5 minutes.
3. Let the sealer soak into the grout for about an hour. The product label you are using will have detailed drying times.
4. After the recommended drying time, apply a second coat, following steps 1 to 3 above, and any other additional coats required.
5. Check the seal by dripping a few drops of water on the new seal. If the water beads, you have a good seal. If the water soaks in, you need another coat.
6. Wait for the sealer to fully dry before using the shower. (At least 24 hours.)

That’s all there is to it: Now you know how to seal shower grout!