I use Sig Koverall on larger planes.
Similar application techniques to silk or tissue (apply & seal with dope, not an iron on)
but once applied you heat shrink it like a film.
It's a type of polyester I believe, similar to modern, full size aircraft covering.
http://www.sigmfg.com/cgi-bin/dpsmar...FV5.html?E+Sig
After doping you put on primer then whatever paint you prefer.
The open areas on this jet are covered in Koverall, primed then painted. - John.