I was building an airliner (A 320) and had purchased aftermarket decals for a Northwest Airlines livery. I neglected this time to scan the decals before starting application. I realize it was tempting fate, and it did bite me! Like so many decals these days the decals was of the super thin variety. There were lots of warnings in the instructions about how thin they were and how to apply them without them looping or rolling over. Still, it was one of those long, very narrow decals, with the Northwest name on it and an edge folded under and stuck to the other surface. It is impossible to unstick those things. Fortunately, the Northwest name, part of the window row decal, was easy to isolate and pull off.
I could make a decal for just the name portion, but I had not scanned the sheet- shame on me. Fortunately, the decal instruction sheet had a nice color side view showing location of all the decals, in about 89% size. I scanned that, enlarged it by the appropriate amount, and printed a couple of copies. The first attempt at applying one worked fine, and the project was saved without buying a new set of decals. I'll be posting a photo of the project in the Airliners and Civil Aircraft forum soon.