Good to know about Consolidated, I have some rims to do.
There is a kind of paint that works well on any kind of metal called "Chassis Saver". It contains the same chemicals that is in the paint used to coat off-shore oil rigs and will totally rust protect the metal. Comes in several shades of black and looks fantastic after it dries.
The downside is that it is expensive at $32 per liter and does not come in spray cans but when I use it I just put it on with a brush. This stuff is like Tremclad on steroids. If you do use use it wear rubber gloves because if you get it on your skin you will require medical attention as I found out after spilling some on hands.