What happens if you don't seal grout?
William Rodriguez
Published Jan 16, 2026
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!
What happens if you don't use grout sealer?
Grout is basically a mixture of sand and cement. 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.
Should I seal grout that doesn't require sealing?
The only type of grout that doesn't need sealer is epoxy, which is inherently pre-sealed.
Is it too late to seal grout?
A. 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.
18 related questions foundDoes 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.
Does grout need to be sealed in a shower?
The grout in your shower should always be sealed; this will block any moisture that could easily enter the very porous material. A sealer will prevent water from becoming stuck behind the tile and grout, forming mold and mildew.
How long does it take for grout sealer to dry?
Any excess sealant will be immediately wiped away. This leaves a thin protective layer of sealer, which will be dry to the touch in about an hour. Grout sealer should not remain tacky, but has a complete cure time of about 72 hours, at which time it will reach its full protective state.
How long do 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!
Can I seal grout after 24 hours?
Others may need a good 24 to 48 hours to complete the curing process, while some manufacturers may suggest a wait time of two weeks. If any of the grout lines are cracked, crumbling or chipped, repair them and clean the area. You will have to wait another 48 to 72 hours before the sealer can be applied.
How do you tell if your 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.
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.
Does epoxy grout need to be sealed?
Epoxy grout won't crack, shrink, or discolour, making it ideal for applying in wet areas, such as showers. It's also highly resistant to the harsh chemicals found in cleaning products. As an added bonus, unlike traditional cement grout, epoxy grout does not need to be sealed, due to its non-porous nature.
Do you need to seal Polyblend grout?
Since Polyblend grout is cement-based, it's a good idea to seal it after it cures. Cement grout is porous, which means water and grease can soak into it and stain or damage the grout. Wait at least 48 to 72 hours after grouting to apply the sealer.
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.
How do you permanently seal grout?
How to Seal Grout
- Sweep the floors to get loose dirt and debris up.
- Clean floors thoroughly with soap and water, allowing it to dry fully.
- Apply the grout sealer evenly over the entire surface of the floor using a brush and wipe up any excess sealer. Allow it to dry completely.
- Repeat with a second coat.
Does a tile shower need to be sealed?
Typically, shower tiles require to be sealed because they contain grout, which is an extremely porous material. To avoid moisture build-up in the grout and tiles, it is always recommended to seal your shower tiles.
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.
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.
Does epoxy grout get moldy?
Surprisingly, even epoxy grout can grow mold, which means we have to know how to clean epoxy grout. Some types of mold can grow in the grouting, backsplash, and also the tile surface. Even the grout residue and other sealants can be a fantastic place for mold to grow.
Can I put epoxy grout over old grout?
epoxy grout is a great choice when you are ready to re-grout a tile project. Because epoxy grout is so much stronger than other types of grout (particularly cement grout), you won't even need to remove all of your old grout. You can apply new grout right over the top of the old grout.
Do you have to reseal grout after cleaning?
Sealing the Grout after Cleaning
After you have cleaned your grout and it looks neat and beautiful again, it's necessary to reseal it immediately. The cleaning procedure removes any remaining seal, which may waste your efforts. Without sealing, your grout's appearance will not take much time to deteriorate.
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.
What happens if I grout too early?
This leads to tiles popping free from your floor or wall, as well as cracked tiles. Additionally, the moisture in the mortar may disrupt the curing process of the grout, leading to discolored grout in areas. Grouting before thinset has cured leads to tiles popping free or cracking.
Can you start and stop grouting?
It's more difficult to stop and restart tiling then to pause and restart grouting. Grouting is usually a much faster process then laying down tile, and can often be done in one day (especially if you're working in a team like us!), but they're still times when you want to pause grouting and continue the next day.