I don't do any in-house digital printing but can fully recommend signs365 dual-view product as mentioned above. Yes, it's $5/sq ft, but is super easy to apply (really thick, doesn't stretch hardly at all even on full 4 x 8 panels, really is a dream to install), they have it to you in about two days, etc. No muss, no fuss. Just make sure to order it with the graphics on the correct side - ask me how I know! I have one customer that regularly (2-3 times a year whenever she opens a new store) orders this from me and she's always been happy with it. I've done a few windows for her with the same images on the first surface and we both like the 2nd surface look more. These stores are all in downtown Philadelphia and she's concerned about vandalism. No worries with it on the inside. Plus they save your files for a long time. We recently had to replace a section of graphic (glass and bullets don't mix) that we had done about two years previously and all I had to do was order another copy of that window panel via their site.