I am covering the top side of my wings this weekend, the pattern I have chosen has a couple of curved seams that pass over open bays in the wing. I do have a large piece of glass to work on so I could lay out the wing panel and iron the seams together before laying it on the wing. This approach has been suggested by several people, and I think I found instructions for this on the "Monokote" web site somewhere before, although I can't find it now.

My question is, if you use this method, how doe you shrink the covering once you have it on the wing? Won't the seam lines get distorted? How do you keep the seams from separating?