Up here in Canada we have this outfit
http://www.canmilair.com/They doe really high end vinyl decals etc
I had them do all the markings for my Fleet 16b (AS SEEN IN THEIR PICTURE GALLERY)
The results were fantastic. Again look in their gallery for examples of Warbirds they have made markings for .
The decals can be applied over rivets , seams, rib stitching etc with
absolutely no air bubbles underneath.
How? their decal material is breathable which means even if you get a small bubble you can shrink it out with a hairdryer with absolutely no distortion . All decals have a clear UV protection, come in gloss semi gloss or flat
They never fade crack or shrink
On a side note I think it helps in the eventual sale of an aircraft as the markings can come off or be changed really quickly
No stripping , masking, paint or cleanup and waaaaay less time consuming to apply or remove