Lots and Lots of people use automotive euro's on lexan.
I really think there's a lot of hype about "lexan" paints, after all Fascolor is rebaged Autoair.
Its such a small market no one makes paint just for it.
There are a few types of paint they all seem to work on lexan if prepped properly, well I've never tried latex. But acrylic, enamel, and urethane all will work.