I have a new tile kitchen floor, and in order to avoid having to seal it, and to prevent staining, the flooring salesperson recommended the use of epoxy grout. I went ahead and did this. It was professionally installed, but the grout lines are not uniform in depth or color. Many of the grout lines don't seem to come up to the level mark on the tile. Does anyone have experience working with this type of grout and could tell me any character querks that it has.