Quote Originally Posted by NatureLady View Post
GS does make a black colored foam called Pond & Stone. From what I have read it is less expanding and some said it didn't go as far as the gap and crack GS.

As for my experience...I waited about 30 minutes, give or take, and then I pressed (it was still tacky, but it easily came off of my bare hands) on it lightly until I got it to was happy with it. A few places I pressed it flat and a few places I just pressed some of the air out, because it was expanding to places I didn't want it to go.

I have a build going called Mossy Frog Build. Go there and I'll tell you which parts I pressed the foam.
this is why you encountered shrinkage. when you press of the foam, it pops all the air bubbles inside, which aid in it's curing process. when you took away the volume, it became liquid underneath and actually started pulling on the rest of the material lessons learned during building are so fun, aren't they?? LOL