The second pour was just like the first. The last pour filled it up and we barely got the end plate on before it expanded out the top. The manufacturer says that if you contain it in the vessel, it will achieve even higher density. I didn't exactly plan it like this but the end plate I don't think is ever coming off again.
When we un masked it, we saw this one little bubble about half way down the tube. Evidently there was a pin hole there where we had welded in a cross brace.
We'll see if doing this yielded any benefit. The Secure set was only $43 delivered to my door. Small price to pay to test a theory in my opinion.