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I've had something similar happen to me. But I shook the can.
I think it's because I just simply had too much greatstuff in one area.
I used it to make a cast of a skull using a skull mold I made.
The bottom of the skull cured, but the inside was just a mess of gloop.
It's because the greatstuff needs air to cure, so when the bottom cures, it doesn't allow any air to get inside for the rest of the GS to cure.
Make sense?
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