Akura nailed it. I used Tamiya poly carbonate black on the inside of the car then hit it with the PS55 flat clear on the exterior. I used about three coats on all of it.
It feels durable and I've seen it used on the Tamiya Porsche cup cars. It looked like it was withstanding a pretty good beating on those cars and didn't seem to scratch. So I went for it. I also used it on the front/rear wings and the mirrors.
Thanks guys!