I’m one of the users that has posted several times regarding Koverall. I use it for all my airplanes but I use it over conventional built up structure where I believe it excels. For covering a foam wing I believe I would stick to monokote. Koverall requires sealing and finishing with dope and it would melt the foam. It might be possible to seal the foam with white glue, then apply Koverall over that but now you’re adding unnecessary weight and work. Also when Koverall shrinks, it exerts a lot of force and that may warp a foam wing. As well as I like Koverall, covering foam wings would not be a good application for it.