No problem! The POR-15 stuff will do the trick and can be applied right over the rust. If you check the link to my car, one of the pictures shows the rear discs and you can see part of the exhaust. It looks great and is a heck of a lot cheaper than jetHot! If you need to do any touch-up ever, just pop open the can and brush a little on to wherever you need it.
Check them out at
www.por15.com