I’ve read that 3M super 77 works, but when I tried it on a piece of scrap it ate the foam. Please help! I can’t find anything that will work. And it needs to be light I’m working on a ½A Ace Corsair.

Thanks

Dark one:

Southern Sorghum is my choice for sheeting foam. Avaiable most hobby sources. Or vacuum bag with epoxy.

3m #77 had a formula change - the old stuff didn't eat foam, the new stuff does.

The Ace foam's not too thin,
. Bash it, make a twin!

Bill.

If you are intent on contact adhesive, then Southern Sorghum is the way to go. You still can get it from Dynamic Balsa.

You might seach this forum for wing sheeting and read all the replies about using polyurethane glue. This stuff is absolutely fabulous for sheeting foam wings, lots better than epoxy IMO.

Vince

SIG CORE-BOND for foam wings. Works great but not in spray can brush on let set for a few minutes roll parts together. #77 will disolve foam if sprayed wet will work if light coat applied to both surfaces and let tack 15 min. before joining parts .

Use the Polyurethane glue. I would avoid the contact cement, you only get one shot at attaching the sheeting and if you goof it up, you've ruined your cores.
The Poly glue will give you about 30 minutes working time and also foam up to fill any possible voids in the wing. Works great, I wouldn't sheet wings any other way.

if you're set on using a contact cement try one of these 2 3m products. I've spray 3m 78 insulation. It doesnt attack foam and seems to hold together well in heat. I've used it since last winter and flew all year long and none of the sheeting I've used it on has lifted.
Also I've just stumbled on 3M 08074 spray trim adhesive. I read something about this in the latest issue of Model Aviation, a guy was using it on building a giant scale Extra 300. Bought a can and tried it around a compound curve and it works better than the 78!!! This is great stuff, only time will tell if it lifts however the people in the article swear they have been using this for years and never had a problem.
Thanks
Tom

I would use 3M #924 Transfer tape on that. It is very light and works well. I have been using it on foam wings for over 15 years. Get the 3/4 inch and lay it on in strips to cover the entire surface. Use a thin bead of white glue on the leading edge to make sure it doesn't come loose while you glue on the LE. It does not have the tape like most. When you peel the back, it only leave the glue and it works very very well. Almost no weight to it and is way cleaner and safer than spray glue.