As far as I know the Chroma system (urethane) is still around.
Curt,I didn't know Centari went to a bc/cc system,but if it's in front of you I guess so.The problem lies in the fact the Nason is an alkyd enamel system (at least last I knew) and Centari is acrylic enamel.They very well could be compatible according to Dupont,I don't know.I did have someone have me use an alkyd enamel generic hardner in PPG acrylic enamel on a county truck and it worked fine,but it killed about 50% of the gloss.No biggie for a piece of crap old work truck,but I never did it again.Good luck on your job.Most people are using urethane now and haven't played with the enamels for a long time,so our answers are based on our experience from over 10 years ago.I personally won't touch the stuff any more since it's ancient technology no matter what they do to it.