512 B build almost complete

The crack was found at the bottom of cylinder #3. I v'd it out, scored it with a rough stone and mixed up a very small batch of Belzona 1111. Pointed my heat gun at the crack for about an hour in an attempt to clean it and open it. Donned some gloves and worked the stuff into the crack. I love this stuff. J.Rob

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very interesting. Is that a casting flaw or another ctack heading downward in the pic ?
Where does one buy the Belzona you used ? I have used the cement Belzona before with great success.