Calflyer, I used Ultracote Checkerboard on the bottome of my wings and my h-stab. Goto page 2 or 3 and you see what I did. Per Chuck at VF, you should actually use a Med to Med-High temp for the iron. The quicker that you get the iron on film to adhere, the better it is for the vinyl covering under it. Just be sure not to touch the vinyl with the bare iron.