Epoxy works on EPS foam, CA melts it

Epoxy also seems better at handling vibration than CA. Some CA's seem to soften with extended contact to fuel as well, though I can't say I'm sure of it.

I've done sheeting with slow-setting, thick CA, just put some on the ribs as you would the epoxy, and place the sheeting in place and hold for a few seconds.

You'd also be surprised at just how far thin CA will penetrate down a seam. You can put the sheeting in place dry, then just touch one side of the rib and run a light bead down the rib. It will soak all the way though, and then some.

While Woodpile's method works, I think he uses more CA than needed, and beleive it or not, CA is heavy stuff.

If you want the absolute lightest way to sheet over wood ribs, the old "yellow" resins (wood glues) are the best by far. Ask an old free-flighter who's been around since before CA about it (that's not me, but I've seen it done. Takes patience though, over night drying and all that)