I've had paint flare up like this John...Always the stuff in a can which is one reason why I don't use it any more.

The stuff I was using - recommended one coat (and touchups within 3 hrs) or 36 hours later.  I still don't know why it flared....Same brand but different can (in my case)....
I was under the impression it was due to contaminants but your shop looks exceptionally clean.

Did you sand, prepsol, wipe in between coats?