Grout drying as 2 different colors?

Question

I grouted my bathroom floor last Saturday and most of it dried a nice light gray. There are parts, however, that are darker. I mixed the grout myself and used the same batch throughout. I thought the parts that are darker may have been thicker and may not be dry yet, but after 10 days, it surely should be, right?

What should I do? I haven't sealed the floor yet because I wanted to hold off to see if it gets to be the same color. Right now its got me pretty concerned...

Answer 1

After 10 days it should be fully dried so I don't really know what to tell you other than taking out the grout and starting from scratch unless the dark parts are small and barely noticeable and since you haven't sealed it yet it would come out easily with a grout tool

Answer 2

sometimes grout can take longer to dry.  there's no clear reason as to why it's light in spots and dark in others.  it could be moisture in the concrete slab, the way it was mixed (some batches being dryer than the other, etc) humid weather or rainy weather, or just simply a bad batch of grout.  i've had a couple jobs over the years where it took 3 months for the grout to fully turn the correct color.  it sucks but it can happen. don't seal the grout yet.  sealer will lock in whatever moisture is causing the splotchiness, and it'll take even longer to dry, since the only way to go is down.  my advice is to just give it time.  if it hasn't changed in a month, month and a half, use a grout removing tool (available at the hardware store) and remove the grout that hasn't turned lighter and regrout it.  worse case scenario--call a tile installer.

save the bag of grout you have left too.  you might need to contact the company to have the grout tested.

good luck.

Answer 3

You may have to mix another batch and try and regrout all at once, this time.

Answer 4

Sounds like the grout was not mixed thoroughly.  You can try to mix another batch an just go over those spots.  You may have to try to get a little of the dark grout out.