Yes I totally disassembled and reassembled the sump and internal walls using the DAP silicone. The Sump is only 1/2'ish full of water. So far it has not had one problem.
I will be rebuilding it down the road. Not right away though as I'm still figuring this out. It will need a new layout for next time. I have read that some people have used that silicone to make way larger tanks with total success. I figured for a 10g sump it should work fine. If it matters I have left a fair amount of extra silicone around the edges inside the tank.
Here is a pic:
http://i101.photobucket.com/albums/m79/hfp75/sump2.jpg