RE: Hinge problem
i have always used yellow carpenters glue on my robart hinge points both the 1/8 and 3/16 and never had one pull out
you have to put the glue into the hole and a little on the hinge point
no way would i use polyurethane on them due to the foaming action
and epoxy is way to messy
as far as c/a hinges go i built a giant scale aeromaster in 2000 the kit came with c/a hinges
they began to break at the hinge point within a dozen flights
i no longer use them on giant scale but would on .60 or smaller airframes