infiniteMPG wrote:
We have a kitchen floor done new with 12" X 12" tile and we're really
happy with the work with one exception, the grout lines. We're
finding we didn't leave the grout line high enough between the tiles
and the edges of the tiles aren't comfortable to walk on. We had used
a grout sealer/stain product called NuGrout on top of the grout to
seal and also color the grout to the color shown on the ad (it turned
out looking gray and was supposed to be light tan). We were wondering
if we can add some grout over top of the old grout to raise the
level. We don't want to get too aggressive with cleaning or priming
the old grout and possible damage the tile face so we thought someone
might have some suggestions.

All help would be greatly appreciated.

I wouldn't try going over it. There is a chance something would
dissolve it. I'd start with whatever the instructions recommend for
clean up and if that doesn't work try another solvent.

Even with a solvent that works, you will still get some of the dissolved
sealer deeper into the grout.

I'd probably go with a grout saw so the new grout can really get in and
make a strong bond.