I just wanted to let you all know that I had great success using Groutshield to change the color of a chocolate grout to a light off-white color. I was initially very afraid of trying it because my backsplash had just been installed and was a light, natural limestone that had not yet been sealed. I only needed to change the border tiles and the center medallion groutlines, but not the field tiles. It really came out nice (and I did it myself!).
The product did not harm my light limestone at all, although I was very careful to remove all excess promptly. This product worked because it is a resin not an epoxy according to the owner Mike. Even my own tile installer could not use his regular product because his rep. said it would have ruined my limestone. I had mistakenly chosen the wrong color grout for a center medallion under my range hood, and I thought I was going to be stuck with it. I couldn’t remove the grout the traditional way (scraping it out with a carbide blade) because my limestone tiles were soft and would have been damaged.
Thanks for making a great product and for your excellent customer service. We spent $3000 on the backsplash between the hand-made medallion, natural limestone and installation, but it was the $19.95 bottle of Groutshield that saved the whole project! Thanks again- Cher and Mike were absolutely wonderful helping me solve this problem in time for the holidays! Cheers!