I have a friend whose seven year old son "purchased" an N Scale layout complete with equipment that is in the future for this group. I needed to attach a Micro-Trains 1015 coupler to a Life-Like/Walthers switcher that was missing the attachment pin. I tried canopy glue and it appears to have worked fine.
On the other hand, I tried canopy glue for an MTL coupler on an Intermountain tank car that is in the time period of this list, and managed to get a sufficient amount of glue into the coupler that it's now "frozen solid." So I'm at .500, which would be great if I were a baseball player. I suspect 'user error' in this second case.