I saw on Vans forum people used 6 inch tube stuck into the big lighten holes to hold the wings. Saw I bought 2 six-foot tubes and stuck them in as far as they would go, which is several ribs worth. On the inboard side the tube goes over the push rod which is really convient.
I removed the rattle can primer to half the trailing edge, but not the other half. I sent the tech support guy a note about spraying Nason paint on rattle can primer and he said that would be better than screwing up the primer. I doubt i could get the primer off due to the angle piece with holes in it (see photo). And if I did I probably couldn't spray new primer in there. So I left that primer and sprayed paint on it. We'll see how it holds. I bet it will be fine.