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Old 04-04-2019, 08:03 AM
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Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,522

Its as well to go back to old days methods .....

Kits 20 - 30yrs ago were common with veneered foam wings ... in fact I had a small 'business' called Wings and Things cutting cores for local modellers back then in the UK.

Joining core wings :

Dihedral angle sanded into each panel end.

Slot cut for plywood brace to cross the joint in its deepest section. A 3 or 4mm thick ply brace is more than enough with depth equal to the core depth. The ply brace cut to match dihedral angle.

Lightweight Glassfibre bandage about 2" (5cm) wide and length to fold completely round the joint.

Two part resin to fix bandage. (Old days we used Polyester for its quick setting - but it eats foam ! so the joint had to be sealed well before application). Laminating Epoxy would be safer.

OK ... how :

Epoxy join the wing halves with ply brace epoxied into its slot. making sure epoxy oozes out all along the joint to seal it. Scrape away excess before it sets. I used to spread it a few mm's either side of joint to be sure.
Once set and wing fixed .... then apply bandage with resin ... wetting out fully and sqeeg'ing to make sure fully contacted to wing skin. Smooth and leave to set.

Viola as they say ...
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