First, put away the trim solvent, it doesn't work on Ultracote (This IMHO is the only advantage MK has over UC).
Now, imagine that you have a sheet of thin rubber - like the material from which a balloon or rubber glove is made.
Now imagine that the sheet is glued down to the wing, and you're going to stretch it around that wingtip so there are no wrinkles.
That's exactly what your going to do with the covering, the only difference is that heat is needed to give it that flexability, and you can only heat one area at a time.
Remember to leave enough excess to grab on to, and wear a glove to protect your hand from the heat gun.
PS, there are some videos that show how to cover in a review I did recently. The first one is very basic, but #s 2 and 3 you may find very helpful. Click on the link below, and scroll down to the section on covering:
http://www.rcuniverse.com/magazine/a...article_id=352