We used Delorean Gray TEC Power Grout in our bathroom. We are still under construction, but I have noticed that the grout gets noticeably darker when it gets wet then lightens up again when it dries. I prefer the darker color and was wondering about sealing it. Power Grout is supposed to be stain proof and not need sealing but I thought sealing might keep it permanently "wet" looking and give extra protection from stains. We are talking about a lot of grout though - a big walk in shower done in 6x6 tiles and the floor is 2" hex. I don't want to go through the hassle of sealing if it won't change the color or will not give any more protection than the power grout gives on its own. And I don't want to set myself up to have to reseal it every year or two -- I have never sealed grout before and don't know how it holds up or how often it needs to be done. Has anyone sealed their Power Grout? Did it darken it? What sealer did you use? And has it held up well? Thanks!

Congratulations on your beautiful new space! What kind of grout did you use? Sanded or unsanded? Epoxy? As others have said, you might want to wait to see how you feel about it. If you decide you want to make a change, and you used a regular cementicious grout you can change the color with a grout colorant. Polyblend Grout Renew performs very well for this purpose, and they have several greys to choose from, including Cape Gray below.

We spoke to the manufacturer and they basically said that this happens and it is the nature of the product. That said, the likely cause was the contractor mixing the new bag I bought with an old bag he had. TEC advised not to use old product or bags that have been open for any length of time. They did suggest using distilled water instead of tap water, but I doubt that was the issue. I made sample boards with tap water and didn’t have any discoloration issues. TEC sent me their grout colorant and I applied 2 coats. This was very tedious and took at least 5 hours for a small powder room to paint every grout line with a tiny brush. However, it did work and nicely covered up the white spots. You can see the painted colorant on the first pic and the pic with the toilet is before the colorant (notice all the white spots). I was very irritated and stressed by all of this, but was relieved the colorant worked and it didn’t have to be retiled.

no easy way to fix it. scraping it out might damage the tile. what's wrong w/the grout?? It looks perfectly fine. Frost is white w/a hint of gray. You couldn't have matched it better if you tried. stop fretting.