It has to be the same covering as on my new/used Dragon Lady. A very heat resistant film that I think they purchased surplus fire suit material from NASA. My only wrinkles were over balsa and I would hate to try to take them out over foam with an iron. If your plane has false balsa cap strips, then I'd try to take out sags on the underside first. As long as you'd have an air pocket between foam and film, it might just work. SolarFilm it ain't.