Todd wrote:
Hi there

When I re-sided my house outside the bathroom window, I pulled on the
window too hard & cracked the grout between the marble tile and the
vinyl window. The window is in the SHOWER so is inherently a danger
for mold, rot, etc. (that's why I had to reside my house!). We will be
installing a shower curtain w/clips to keep water out of the window.
However, I have to replace the grout.

So far, I pulled out all the grout and caulk. It looked like someone
had mixed the grout with the caulk somehow (the caulk was very
discolored and thicker than plain caulk).

Now I'm trying to figure out my next step. Two days ago I installed a
layer of Silicon II caulk deep within the crack, thinking that might
provide an extra layer of sealing/protection if the grout fails. On
the sides of the window there is still about 3/8-1/2" depth for the
grout. On the flat horizontal surface, there is about 1/8-1/4" depth
remaining.

Caulk is not one of those "more is better" products, so you don't pack a
space with it. Probably no harm done. When there is a gap to be
filled, there is a product to use before caulking. Round foam strip,
found in caulk dept. You just need a very clean and dry base to apply
the right caulk to - silicone is the pop choice for bath/shower
enclosures.