Thanks Nick, I want to do graffiti for railroad cars. I have taken tons of photos of real cars. The trick is to isolate the image, and organize a bunch to fill a sheet. The tip about the printer setting and the over spraying was really what I was after.
I have both white and clear film sheets, but I haven't tried them yet. I'm leaning toward the white for the graffiti for two reasons. First, a lot of images need white and without the increasingly rare Alps printer, you can't print white. Second, inorder to make the colors pop on a dark car, the film should be opaque. I bought a number of sheets of graffiti off eBay a few years ago, which were printed on clear. They were just OK on light colored cars, like grey. Brown cars would be a big time fail.
I hope this gets some more of the guys here to try this. It's fun and not very expensive.