My experience is a little different than above. I think it depends on the printer. I have an inkjet printer with pigment based inks. (Epson R1900). I have found that the ink will run unless I spray I light coat of decal spray over the decal after the ink has set for 24 hours. I use Testors Decal Spray in a rattle can. After that, I can use mild decal solvent and I watch it. I don't have a laser printer so can't speak to that. I have found that black and darker colors seem ok, but yellow ink doesn't go on thick enough to hide the background color. If the vehicle is white and the same tone as the white decal paper, you should be fine with any color. If using an image-based program like Photoshop, you will likely see some jaggies, especially with smaller decals. Illustrator or other vector-based programs are preferred but very few people have access to them or know how to use them.