RE: ultracoat and compound curves....advice
Just work slowly and take your time. Do small sections at a time.
Do ALL the tacking ON THE EDGE of the wing tip. Stretch and tack the center, then do each end (leading and trailing edge ). Then go halfway between and tack again. Keep doing the "halfway between".
After everything is tacked down and pulled tight and as wrinkle free as possible (you will have some wrinkles ), increase the heat on the iron and seal the Ultracote TO THE EDGE OF THE WING TIP.
Now take the iron, and keep it a little above the covering (you do not want to "iron in" any creases ) shrink the covering down. If you have any stubborn wrinkles, while pulling on the covering in the wrinkle area, CAREFULLY use a heat gun. By pulling while using the heat gun it prevents the covering from "sliding" on the edge of the tip.
Like anything else, it will take some practice, however Ultracote is a lot easier to make CONSISTANTLY good covering jobs on compound curves.
Make sure you watch your heat level, Ultracote is a low temp film. I suggest using an iron instead of a heat gun. Use the heat gun ONLY for stubborn wrinkle areas. The heat gun can easily burn through if you are not very careful.
Remember, once you heat Ultracote (or any heat shrink covering ), you need a higher temperature in order to shrink it more. If you shrink it a 220 degrees, you HAVE to go above 220 to do any further shrinking.