I used to do that, too, but 3M77 now eats the foam due to some reformulation, was heavy, and prone to delaminating. Southern Sorghum was just heavy, otherwise OK.
I think any form of contact cement is pretty well obsolete , epoxy is much lighter and much more stable. And as noted above. polyurethane glue like Gorilla Glue seems promising , but I haven't tried it.
Brett
When it came time to sheet all the foam on Pushy Galore, I decided to do a bit of research and testing first. The reason was the model was mostly all foam except for the fuselage.
Yes, the 3M77 has changed quite a bit and is no longer suitable to sheet foam wings.
I'm not sure if Epoxy is heavier or lighter than contact adhesives, I've never done any tests.
I never sheeted balsa to a foam wing using Epoxy and I had no interest in using Epoxy for various reasons.
I called around and spoke with a few competent contractors who do furniture restoration.
Two of them suggested the same aerosol can contact adhesive which is available at Home Depot. I will dig up the can if anyone is interested.
I was
not going to use the product without testing it first. I had a piece of foam available, actually an old wing core from my R/C pattern days.
I followed the directions on the can, unusual for me, and sheeted tops and bottoms on two sections.
I actually mentioned this long ago when I inquired about sheeting the foam on this model.
Anyway, this was a few years ago and I'd have to look at the Pussy Galore build to see when I sheeted the model.
I put the sheeted samples outside in the Florida environment for 2 weeks. Exposed to the elements. Hot sun, rain and all you would expect.
2 weeks later I was shocked there was absolutely no separation of the sheeting or the foam.
The remainder of the can I used on this model.
Only the fuselage and the wing tip verticals are balsa, everything else is sheeted foam.
All this time, and the model has been in a hot storage space upstairs and in an air conditioned environment. Absolutely no separation and no changes.
The model is for sale BTW, in our Classifieds.
Choose wisely.