I once owned an ultralight aircraft called "American Falcon". Some of
you may recall their adverts on the back of some flying mag , with
Chuck Yaeger's face endorcing the little high wing canard.

It's wing is/was covered in Tedlar. This is a Du-pont product that is
stuck to the top of ribs etc with a foam backed doubled sided tape,
and subsequently heat shrunk. I re-covered the wing myself with the
help of a couple of friends.Any joints are done with a simple 2" wide
lap with an 8 thou' 1" wide polyester double sided tape.

My guess is that with a strip of polyester doubled sided tape along
the trailing edge, top and bottom just ahead of the ailerons etc, a
perimeter of this around the airbrake box, place some more around the
root and tip, this would do a great job.

Tedlar is used as a decorative/protective coating on all those
compound panels you see around windows in 737's etc.

It has a huge shring rate, and would certainly give a wrinkle free
finish if applied correctly. Better still the roll of Tedlar I got (in
white ) was 1.5m wide.



Cheers

Mark