RC Outlaw,

To answer your question about why the hinges are failing then I would have to say its most of the time user error. You must have enough glue but not too much, enough gap between the surface but not too much and you really need to seal the gap between the surface. I think a lot of times it comes back to the fact that the hinge is binding b/c the gap is too small or too much CA has gotten on the part where the hinge pivots and this can make the hinge brittle.