Most 2 & 3 mil vinyls are translucent but many have an opaque adhesive. We have use Avery MPI 2920 and General Formulations 210 which have a clear adhesive and printed on our Falcon II and HP 25500. We have installed these materials on a number of light boxes over the past 3-4 years. We installed one across the street from our shop which has been there for more than 2 years facing west, and still looks good. I am sure if I held a something not exposed to the sun it would show some fading, but without that comparison, it looks good. I would suggest laminating, bird poop is hard on the ink.