POR-15 - http://www.por15.com
Hope this stuff works - we put it everywhere! Basically any exposed metal was treated, as they instructed, and painted with many coats of POR-15. We also used their manifold & engine paints. Also did a top coat in places with their chassis coat black. And as we found out, it's pronounced P. O. R. 15, not "pour-fifteen"
I spent days painting with this stuff and I'd prefer to never see it again - but I wouldn't have changed anything.