Several tile books I own say that you should always "silicon any 90
degree angle where tile meets instead of grout, to avoid cracking
grout joints." That means they wants me to silicone the inside
corners of all the tiled walls in my bathroom, plus where the wall
meets the floor tile too. I just wanted to get your opinions... do
you use grout or silicone? Of course, if you say silicone, the next
obvious question is -- how do you get the exact color of the grout?
If your wife picks "mango-friggin-surprise" as the grout color, that's
a far cry from white or almond! I suppose you could sprinkle some
grout powder into the silicone but no thanks. I know enough to
silicone where the tile meets the tub, however. I also leave about
1/4" gap too.
p.s. Whoever grouted my existing bathroom decided to grout all inside
wall corners in the shower too... and they're all cracking if not
already completely deteriorated.