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Do you have to seal grout?

Author

Emma Payne

Published Jan 23, 2026

Grout needs to be sealed. It's naturally porous and will stain easily. Most installers of tile floors do not seal them because grout has to cure first. It's something you should do to keep your grout looking it's best.

Is it really necessary to seal grout?

Therefore, grout sealing is an incredibly important process for your tile surfaces. Not only does it help protect your grout from spills that make it susceptible to stains, grout sealing helps protect your grout from mold and mildew growth, strengthens your grout, and slows down wear-and–tear.

What happens if you don't seal grout?

When grout is not sealed in time, grime and water can seep into it, causing cracks on your tiles and forcing them to break at a certain point. By sealing your grout, you get to prolong your tile surface's lifespan and minimize damage to a considerable extent.

Can you leave grout unsealed?

Grout is cement-based and the pores will literally take in all the stains, grime and bacteria that lands on them if they aren't sealed. In other words, if at this very moment you are standing on a tile floor with grout that isn't sealed and you spill red wine, your new grout will be stained and ruined!

Should I seal grout that doesn't require sealing?

You should only apply grout sealant to cement-based tile grout. Synthetic grouts such as epoxy and urethane do not need to be sealed; sealing synthetic grouts may do more harm than good for your precious tile grout.

20 related questions found

What happens if you don't seal shower grout?

As a result, if you don't seal your grout, it will absorb water, bacteria and stains. Adding a grout sealer protects your grout so it's water resistant and will repel moisture and germs. Sealing the grout helps prolong the look, texture and consistency of your grout and it prevents mildew and mold.

Does sealing grout make it waterproof?

Sealer soaks into the grout and supposedly makes your tile and grout waterproof. People who want to sell you grout sealer will tell you it keeps it easier to clean, and helps prevent mildew from growing.

How can you tell if grout is sealed?

How to Tell If Grout Is Sealed. You can sometimes tell if your tile or grout have been sealed by spreading a few drops of water on them. If they darken or change color, they are probably not sealed. If they stay the same, they may have already been sealed.

Does tile need to be sealed?

The surface of most ceramic and porcelain tile does not need to be sealed, although some require a light application of a penetrating sealer to fill the micro pores on the surface of the tile. However, the grout joint between the tiles is usually very porous and generally made of a cement-based material.

How long should you wait to seal grout?

We recommend waiting for at least 48 hours after installing a grout before you apply a sealer. Older grout should be cleaned thoroughly before being left to dry. Make sure to protect grout from spills and stains during this time, otherwise you'll be sealing in the dirt instead of keeping it out!

How often should grout be sealed?

For high traffic areas, like the main bathroom, you should consider sealing it every six months, while low traffic areas like the guest bathroom can be resealed every two years. If you are using epoxy grout, it might not be necessary to reseal it as it is highly water-resistant.

Can you grout over grout?

The short answer is, “no.” You cannot put new grout over old grout. With regard to filling in holes and cracks on the surfaces in our homes, we might compare grout repair to drywall repair. For holes in drywall, we would simply purchase spackle, and fill the hole in.

Do I need to seal the grout in kitchen backsplash?

The short answer is no, but most of the time, traditional tile with grout can always use a layer of sealant. Epoxy grout doesn't need to be sealed, but any other format should have a sealant applied to keep your tiles and grout lines looking fresh and new.

Should you put silicone over grout?

You can also use clear silicone over existing grout to seal hairline cracks in corners. You'll only want to do this if the grout is in good condition and if you clean the surface, dry the area and apply acetone. Don't be frustrated if the end result doesn't look as nice as you expected.

Can I seal old grout?

You can seal the grout the day after you applied it or 100 years later. If it isn't dirty, seal all three sides of the shower with a tile sealer or masonry sealer. That will make the grout water-resistant, if not waterproof, and help prevent the growth of mold and dirt.

What happens if you don't seal porcelain tiles?

I assume it is a cementitious grout, which is porous. Put generally speaking you don't have to seal it. It will get darker over time whether you seal it or not, but it will be easier to clean and will less likely stain if you do seal it. I assume you have a glazed porcelain tile.

Do you seal tiles before or after grouting?

Porous tiles should be sealed prior to grouting (ideally prior to installation), again after the grout is fully cured and then reapplied as required. Sealing the tiles prior to setting them is the most ideal time. This will protect the tile from mortar staining if some gets on the face unexpectedly.

What happens if grout sealer dries on tile?

If it dries up on the tiles, then a thin film of haze is formed on the tile surface. As a result, the tile loses its shine and beauty. Grout sealer removal is important to retain the attractive look of the tiles.

What does unsealed grout look like?

If it gets darker or changes color, it is a clear indicator that the grout hasn't been sealed. However, if the color remains the same, the grout has been sealed properly. Another way to check if the grout has been sealed is to monitor the water beads.

Is my shower grout sealed?

After you allow it to fully dry, then it is time for the second coat. The number of coats you will need depends on your desired level of coverage. You will know your shower is properly sealed when the water beads on the surface of the grout roll freely without soaking in.

How do you unseal grout?

Here's what to do:

  1. Mix up a solution of about 3 tablespoons powdered oxygen bleach (something like OxiClean would work) and warm water in a 2-gallon bucket.
  2. With a sponge or cloth, swipe it around the surface until the grout lines are full.
  3. Let it soak in for at least 15 minutes, then rinse well with clean water.

Can shower water leak through grout?

Leakages in the shower are most often the result of grout failure. Leaky tiles can be found anywhere where there is water. The shower water leak should be repaired quickly otherwise, the buildup of stagnant water will lead to mold and damp under the tiles.

How do I prevent mold in my shower grout?

To prevent that, there are a couple of things you can do.

  1. Ventilate. If your bathroom doesn't have a vent, you should ventilate it in some other way. ...
  2. Dry. ...
  3. Shower Door. ...
  4. Hang Towels. ...
  5. Spray Tiles. ...
  6. Let In Light. ...
  7. Clean Shower Items. ...
  8. Seal Grout.

Does sealed grout darken when wet?

So the answer is no, color sealed grout will not get darker when wet or lighter when dry. The appearance of color sealed grout remains consistent. The only exception would be if there is a moisture problem underneath the grout.