I completely renovated one of my bathrooms over 2 years ago...new tub,
ceramic wall tile, etc. The gap between the top of the tub and the
bottom edge of the 1st course of tile can't be more than 1/8". No
matter what material I use to fill it, it eventually cracks,
separates, and gets moldy looking. I've tried grout, standard latex
caulk, anti-microbial caulk. I've tried to fill it in 2 segments...
1st fill the gap under the tile and behind the front edge, let cure,
then do a "finish fill" of the front edge. That doesn't work either.
A few months later, it looks like crap.
The old tub is actually much lighter than the original so there
shouldn't be any settling. Besides, its been way too long. The only
thing I haven't tried is rubbery silicone caulk.
Any ideas? Is silicone the answer??