Thanks for the positive comments regarding my work. They are appreciated.
As for the window tinting technique, I don’t have any colors/brands to suggest to replace the (discontinued) Humbrol colors. I still have enough of their old formula metallic green, metallic blue and clear enamels left to last about a lifetime, as very little is needed for the tinting process. Thus, there has not been any real reason for me to try to find a replacement. What is vital is that the paint used does not react with clear plastic and it must withstand handling without the paint rubbing off or cracking while bending the ”glass”. Hot lacquers are ruled out, possibly waterbased acrylics as well. I would try blue and green enamel candies mixed with clear enamel. It is possible that Alclad enamel candies, mixed with clear enamel (the old style yellowish type) could work. It is vital to thin the mixture with a compatible thinner so that the tinting has enough time to level properly.