I did a few tests with poly glue on hinge points and was not happy. I was very careful not to use too much glue, but it still epanded to the point of fouling the hinge requiring quite a bit of work to clean up the hinge knuckle. But! The hinge was glued in so well that when I did a pull test, I literally ripped thhe hinge in half before the hinge pulled out of the balsa. I'm going to stick with epoxy. It's easy to use and won't foul the knuckle like the poly does.

Just my .02

John