Sigment and Titebond are solvent-based adhesives, that work by soaking into wood and then drying out. They won't soak into CF/epoxy, so they'll never stick -- sooner or later they'll just peel off.
Epoxy and CA will both make a chemical bond. CA is brittle, which is a bummer when you're mating two dissimilar materials like balsa and epoxy. Epoxy is heavy, which is a bummer when you're building a stunt plane. Pick your poison.
If the epoxy is shiny, then it probably has mold release on it*. You'll want to sand the mold release off. You're NOT doing this to give the surface mechanical "tooth"** -- you're doing this to expose fresh, un-oxidized potential chemical bonds (mechanical engineers call this an "activated surface") that will bond more readily to the glue. If you sand it and then go away for a week before you glue, you might want to hit it again, because the bonds will have had time to oxidize in the air.
* Freshly rubbed and polished epoxy or polyester paint is really shiny, but does NOT have any mold release on it and unless there's silicone or wax in the rubbing compound, DOES have those horny little un-oxidized bonds waving around, just waiting to hook up with anything. Drop some catalyzed glue on that surface and it'll stick like a bandit.
** OTOH, if you're painting it with lacquer, you ARE sanding it for mechanical "tooth", because that's the best you can do. In that case you want lots of roughness both for "tooth" and for increased surface area.
Topic: Glueing balsa to formed and cured CF parts (Read 3076 times)
