I use epoxy, but keeping the glue out of the hinge is the same problem.

I use Vaseline. Bend the hinge one way, and dip it into the Vaseline then bend it the other way and repeat. Some people use a heat gun to melt the Vaseline into the hinge, but I find it works OK as long as the hinge is covered completely..

Then, when you insert the hinges, the Vaseline stops the hinge gluing together and it also lubricates it for use.

You should insert both sides of the hinges at the same time and work the hinges carefully a couple of times before it sets, so it aligns properly.

-David C.