Our flooring installer (ProSource Edmonton) installed the wrong grout color: completely their error. The project did not turn out as we had planned, and I was very upset and angry. I was also the biggest skeptic when they recommended Susan at Enviro-Clean to "paint" the grout to change its color. Susan was very patient and helpful. She made sure our color choice was the right one, and proceeded to correct the grout color. The work was quick, clean, and turned out really great. We are very happy with the transformation of the flooring project! It looks so much better. We like the blended darker grout color, and so far the color is holding up. Susan left us with some colorant for touch-ups. She said her labour is warrantied for two years and the product is warrantied for 15 years. Susan has assured us that its durability is "better" than the original grout (presealed Mapei CQ Flex-Color). Only time will tell.