FYI: POR15 does not hold up uncoated. You should put a coat of paint on top of the POR15, it does not hold up to the UV rays and turns to a chalky white color. It is intended to be a rust stopper not a final coating and needs a top coat.
Not being an @$$hole or anything but I don't want you to end up in the same boat I was in when I built my first truck. POR15 sucked as a top coat item, then I read the directions and figured out why, it states to top coat it.
From POR15's directions:
10. POR-15 should not be applied over other
paints. It is UV sensitive and must be topcoated
with an opaque paint if left exposed to
1981 CJ8 - http://www.jeepforum.com/forum/f8/project-krawln8-81-cj8-1276742/