In contrast to a sealer, an impregnator works below the surface of the building material, rather than creating a film. It does this by chemically bonding and penetrating into the material. Instead of sealing the pores of the material, it lines the pores.
Once the grout has completely cured, proceed with the sealing of the grout for water and stain resistance. Apply 511 Impregnator Water-Based to all grout with a thin paint brush.
It is imperative to use an impregnator for all polished and smooth surfaces since surface coat sealers will not adhere properly and can be easily worn away.
The Drawback of Using Grout Sealer
Moisture can still pass through most sealers, meaning grout isn't entirely waterproof even when sealed. Over time, grout in areas like bathrooms will naturally stain or show signs of aging, regardless of sealing.
Final Verdict. Our top pick, Aqua Mix Choice Gold Marble Sealer, is a water-based, long-lasting product with excellent moisture resistance. It helps ward off stains from oils and other liquids and even helps prevent the growth of mold and mildew in the grout.
While the tile industry does not require sealing, it is always recommended, especially in wet or high-traffic areas. Penetrating sealers are the most commonly used and offer high water, chemical and stain resistance. They provide protection without changing the appearance of the grout joint.
Jim Whitfield, manager of Technical Services at Mapei told industry professionals, “Because epoxy grout is so tough, it wears extremely well. It doesn't wear down over time and become a tile gutter—like cement grout can—where all the dirt and liquid and junk collects.”
Whoever installed your floors most likely did not seal the grout because it needs time to harden and cure completely.
Using Too Much Sealant
You might be tempted to use more grout sealer to get the job done quickly, but an excess amount can easily spill over onto the tiles. As a result, unnecessary time will have to be spent scrubbing the excess sealant off.
Epoxy grout doesn't need to be sealed at all.
Long-term, with no film to break and with the breathability of the building material maintained, the lifespan of an impregnator far exceeds that of a sealer.
Apply sealer according to directions after tile has been bonded for a minimum of 24 hours, or apply to front face of tile before installation. Wait a minimum of 2 hours before grouting.
It is important not to leave any excess sealer on the tile surface because it won't get absorbed and it can leave a sticky surface that can become a maintenance problem.
I recommend 2 coats six months apart just after you have let the slate tiles flake down a bit from foot traffic. After that point you are good to go.
Be sure to let your grout sealer dry thoroughly before testing a small area with a few drops of water. If the water beads up, you're all set! If not, you'll need to apply an additional coat of sealer to your grout. Most grout sealers take 1-3 coats for best results.
Unsightly Grout Stains and Discoloration:
One of the most noticeable effects of neglected grout sealing is the gradual accumulation of stains and discoloration. Grout is porous by nature, which means it readily absorbs liquids, dirt, and debris.
Start by making sure all grout is clean, dry and intact.
Grout also needs to be completely dry before you seal it, or else it won't bond properly with the tile.
The other condition that can cause grout to turn white or cloudy is if water is trapped under the tile and the grout is sealed with a non-breathing sealer. If this is the case then you have to remove the sealer if it is a surface sealer. If the sealer is deep into the grout then you might have to replace the grout.
Professionals often use steam to loosen the dirt and other particles trapped in the grout without needing to scrub manually. While every steam cleaning machine is different, you'll follow this basic process to clean grout lines: Use a steam cleaner with a small nylon brush attachment.
However, caulk is usually a better choice in areas where moisture will accumulate, thanks to its flexibility. Caulk is also much easier to clean. While it is porous, it doesn't absorb dirt as much as grout does.
If you're trying to unify your tile, such as with a wood look tile floor, go for a close match that's a little bit lighter than your tile. If you want to highlight a color or accent in your tile, like the gray veins in a marble tile, go for a close match, or a bit darker than that shade in your tile.