I am currently painting my trim with Krylon fusion for plastics, and it seems fine. It does dry pretty fast and provides good coverage, but when I got some on the metal I was able to wipe it right off with a towel. I would not promote trying to paint without taping off though. I am only doing two coats of paint, but even one had them looking like new.
I can't compare it to the Dupli-color. I have it in my head that Dupli-color is cheap-o paint but I have nothing to back that up with, just something that is stuck in my head.