I should of put in a BUT.  I use the paint on vinyl method for smaller bits that don't go on compound surfaces.  At one point before digital printing I was doing a 3 stage paint process on white and black vinyl then cutting the painted vinyl.  At the time I was using a House of Colors system with their high image clear.
Another trick I used was airbrushing enamel toners on different colored vinyls.  Could get colors that would sear your eyes and they would last.