The M90 may not be the right stuff for this, but I gave it a try. The crack is large, so I didn't feel comfortable using thin set, and I'm not sure caulk is the right choice either, for the same reason. We'll see! Here's the crack with the M90 in place. With this material, you overbuild and then take it down. You have to wait a few hours in between though, so we headed out for lunch and a run to the hardware store. We need a belt sander to finish the terma (we may employ it other ways once we have it...thinking about sanding the face of the gau on the Enlightenment Stupa...). We also picked up some caulk for the lotus petals, and velcro for the brocade...(who knew velcro was so expensive?). : )