"Lew Hodgett" wrote:

I'm clueless, but based on your description, sounds like thermal
run
away caused the expansion.
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"dadiOH" wrote:


Could be, it was hot as a pistol. Way to hot to handle.
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"Lew Hodgett" wrote:
I like to use slow hardener with microballoons and limit thickness
to
1/4" max per pass.
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"dadiOH" wrote:

I had 3:1 hardener and 2:1, used the 3:1
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Break open the 1/2" piece. If it is foamed like an ice cream soda
inside, two things.

1. You definitely had a run away exothermic reaction.
2. You have a structure that is totally useless.

Time to grind out and start over.

Lew