Well, I got the wing on my 4*60 (built upside down) apart, and after ten minutes with a heat gun pulled the shards of the dihedral brace out.

Doesn't look too bad.

Anyway, there is old epoxy on the inside ribs. I tried scraping it off under heat and it worked ok, but how clean does it need to be?

I'm going to insert a new rib-shaped "shim" between the wing halves to correct the dihedral angle and add a new brace before applying the fiberglass tape.

Do I have to get down to bare wood or what?

GB