Not into the whole patina thing myself but this was an interesting way to clean up rust but retain the patina look some like. Never tried it so proceed at your own risk. http://67-72chevytrucks.com/vboard/showthread.php?t=447159
Somebody here did something similar to the deck lid or roof of a sunburnt Cutlass Supreme. Slightly different products, but similar results. A quick search didn't yield anything and I'm too lazy to dig for it. Pretty interesting process. You wouldn't think there is any color under all of that rust.
