I normally don't mix paints to achieve a certain color, I'm colorblind. So I look for these already made up. MCW now has small jars of unthinned enamels in lots of useful shades such as correct engine colors, tinted carburetor and others.
Whatever is "toxic" in the red tube makes it work better. I tried the blue out of necessity before and didn't like it, but it's been long enough ago I don't remember why. I am sure someone will be able to technically explain the difference.
I looked at the sites I deal with looking for the Cady sheet and came up empty. If all else fails, try STS decals, he can custom make some for you. He is busy, so he patient.
Most of the time the caster/printer vacuum forms the glass over a buck they make. There are a few who use a real slow, like 24 hour, cure clear resin and cast them with a mold.