Oh jeez.............

No lie..... there is a model that has what looks like CA hinges going directly into FOAM. Amazing. And not very sensible at all. Undoubtedly, it must have worked on more of their stuff than not, but that still isn't very sensible at all.

If they are hinging directly into foam that really is a poor technique. Foam is a very poor material to resist the forces required to flex hinges that are probably somewhat stiffer than the foam will be, even with the possible strength added by the epoxy. The force at the hinge needs to be carried right at the hinge line. Foam won't do that worth spit. Hinges work up and down as well as out, and foam doesn't wear well or resist working worth spit. If the hinges aren't very pliable, the foam will be the weaker of the two. Have you seen any very pliable CA hinges that were still strong? Heck, just seen any very pliable CA hinges!

Nope, there ain't no such thing as instant epoxy. So the probability is that they meant some other kind of instant glue. And if that's the case and they didn't recommend foam safe CA, then they best use foam that can at least stand CA without melting.

Foam really won't hold small areas glued directly to it. It's main strength is in area. Reduce the area and you wind up with little or no stregth. Even if you added a thin plywood TE cap to the wing to keep the hinges from working up and down, the hinge would still have to be very well glued to the TE cap to have much hope of staying attached to the airplane for very long.

If you are building the CMPro Corsair, you'd best solve that situation on your own. I have no doubt the CMPro design (if you figure out what glue to use and happen to choose one that doesn't cause damage) would work for awhile. Do you buy your models with the expectation that they aren't built to last. They might not, but they still shouldn't be designed with little hope of it.

Do their instructions not explain wicking the glue into the previously inserted hinges? That's how CA type hinges are glued. And epoxy doesn't wick worth spit. Their picture also gives the impression you'd apply the instant glue and then insert the hinges, at least one side. Instant glue doesn't do a job like that worth spit either.

Some mfg's really need experience flying model airplanes.