I have been building a Sig Sealane kit for about a month now and have used Elmers Ultimate Glue, which I have had onhand for a while. It is a plywood and balsa laser cut kit and have had excellent results with the glue. Now, I have been doing some research here to understand people''s oppinions of glue vs. Epoxy and they seem mixed. I glued the wing joiner in with the Poly, but I still need to mount the engine pod and boom to the wing (1/4" ply connections). This glue does not seem to foam up as much as the Gorilla brand glue, and it seems to penetrate the wood much better than a 30 minute epoxy, but I am concerned that it will become more brittle than the epoxy and loosen up with engine use. Does anyone out there have experience with a boom mount using the poly glues and if I should avoid it? I don''t have epoxy, but can certainly buy some if need be, the poly just seems like it has been a great glue to work with.
Thanks,
Curtis
P.S. I am not looking for a rant on Epoxy vs. Poly, just some practical experience and concerns.

I've been using the stuff for years and have yet to have any problem with it. I haven't used it in exactly the situation you are doing, but sounds to me like it would be fine. I love it for sheeting foam wings laminating and anywhere else where you need structural strength. I also notice that Gorilla glue seems to foam more than Elmers, but also noticed that it sets up quicker. When I first got some, I did some tests with it to see how strong it was. It sure satisfied any of my questions.
Just my opinion,
Randy

Put a bit of Elmers in a lid, mix a little water directly into the glue and wait till start of bubbling and apply to damp misted surface. I find it foams more and is quite strong.

i use Probond for wing sheeting, firewalls etc, i have had better results with Probond than Gorilla Glue for some reason and with all the time we put into assembling a plane i reach for what i trust.

david