Hi!
If I understand you correctly you say that you can't paint your airplane because of hardened CA glue on the fuselage and wing. Well, its never good to paint directly on the balsa anyway so a much better way of doing it is to cover the balsa with something first. tissue and dope is the old method and using glass fiber (25g) and finishing resin (either polyester resin or 24 hour epoxy resin) is the more modern way of doing it.

But why don't just sand away the glossy CA overflow and use Oracover (Ultra-cote in the US)plastic film which is much better than MonoKote and easier to use. Much lighter than the finishing resin method.

Regards!
Jan K