ORIGINAL: SeamusG
I've tried Gray Beard's approach without much previous experience and the ailerons ended up a bit saggy as the covering wasn't real straight at the hinge line resulting in more wrinkles than I could shrink out. With more practice ...
I have run into that with Monocote but I have only been using Ultracote for a lot of years now. Covering and how it shrinks is a good point. I also leave my covering several inches over size just so I have something to grab onto and stretch over the surfaces. It takes a little time to get it figured out. Not really a must do thing but I thought I would mention it.