If you do not flex the hinge back and forth continuously while the epoxy is curing, it won't wick into the hinge knuckle. Usually, what little epoxy does flow over the knuckle is easily chipped away by flexing the hinge after the epoxy hardens. If there are any small amounts of epoxy left, it can be flaked off with a #11 blade. Vaseline or other plastic safe oil is good, but not really needed.

just my .02

John