I use Worldtex from Horizon. I can't say enough about this stuff. No sags, wrinkles or bubbles and it stretches around curves like fabric because it is fabric. I also use Koverall adhered with nitrate dope and paint it with butyrate dope. That takes more prep time, however. You can see a Worldtex covered Sr. Falcon and Kaos, and a Koverall/dope Dirty Birdy in my gallery.

David