I've had two clients call me within a year that the grout color sealing has not held up. One I returned $1,500 because the color sealing was wearing out in a few areas and looked horrible. The other one was a reclean becasue it got soiled within a year and I had to retouch some color loss. I have done about 20 color sealing jobs with just 2 complaints. It appears to me these two clients used harsh cleaners on the floor. Because of the uneven floors and high grout lines, color sealing can wear out on those high areas, plus I don't have the confidence that the client will properly take care of their floors. So I'm done!