Josh did this a few months ago, to the hood of the 69, after reading that post you showed the pics from. It does indeed work. He has pics somewhere, which I will ask him to post. But it is essentially the same as the ones above. Cept he rattle canned flat black over it.
I will admit, I was a bit skeptical as he raided the cleaning supplies to do rust cleanup on his truck. Even went outside to see wtf he was doing.... it does work.
thread on it at impalas.net