Grout Dried to Wrong color
I cut out and replaced about 3 feet of cracked sanded grout (1/8 inch) using the same exact grout and color originally used. However, after 4 days, it dried much darker than the original. (Beige instead of a sort of antique white). I am told it is because the substrate was too dry, causing the grout to dry to fast, and the only solution is to cut it out and re-grout. Is this a valid explanation? I would like to be sure, because it is a lot of work to cut it out.
Since the tile is very dense porcelain, I did not bother to mist it with water before applying the grout. Also a couple of years ago, I did a smaller repair of about 8-10 inches the same way and it turned out fine. I use Polyblend color 382 (bone) sanded grout, bought just 2 weeks ago.