I have laid the tile for the tub deck but not other tile in the bathroom. I was going to grout the deck before installing the tub but then began thinking that the grout color might not be consistent. I probably won't get to the remainder of the wall tiles for a few months. Is it OK to leave the tile ungrouted for now? I can grout later of course but those tiles not exposed would never be grouted. Since the tub lip will be sealed with caulk theoretically at least the ungrouted portions would never be exposed to moisture. Ideas, opinions?