I used chassis saver, antique satin black. It was highly recommended by a friend who has had good luck with it. Im planning for my truck to be a nice dependable daily driver. The paint store also told me it was more durable than por15 ( I dont know if it is or not). All I know for sure is, WEAR GLOVES IF YOU USE IT! The stuff has to just wear off your hands, so I figure its pretty good stuff. You can find out the specs at
www.magnetpaints.com