I ran
http://f3a.sakura.ne.jp/radiocontrol...ustar-z00.html
thru this translator:
http://www.worldlingo.com/en/website...ranslator.html
It says that they were using silk. From what I could make out, they were using epoxy resin with talc and silk. The translation doesn't do everything, but gives you the general idea of what they are talking about.
Jon Lowe