Splais,
All printed materials, vinyl or otherwise will eventually fade from UV light. Printed vinyl requires another clear layer of vinyl over the printed layer. Could get 5 mil thick.
Layering vinyl to obtain colors is what I offer and do. I have no printing equipment. For my commercial sign business, I have resources for this printed material, as applied to trucks, vans, trailers, etc.
Most vinyl is 3 mil in thickness, longer lasting vinyl, 8 years or so is 2.5 mil thick.
Every model you see at this link, except for a few that have used paint masks, were done with layered vinyl for coloring. No different than paint with a taped edge. Some guys apply a clear coat over vinyl.
Here's the link and it's all my vinyl work, but modelers applied the graphics. Talented guys with great looking models! Kudos to all of them!
http://www.rcuniverse.com/community/...ry&memid=11343
Charles