"Ross Payne" wrote in
:

I regrouted the floor of my shower, and I think there's a problem. The
grout turns gray when wet, then white again when it dries (the old
grout on the walls doesn't change color when wet). I used an unsanded
white grout (Mapei), and sealed it too. Any ideas? Thanks.


Not a tile wiz but had the same issue once. If it's changing color it's
getting wet. It's not being sealed. Try a different sealer.

Floor grout should be sanded grout BTW.