I ordered some Colorgard Stainless from Eastwood for my headers. I have not used it yet, but after reading the instructions I went to the web site of the company that distributes the coating. They have a lot of coatings and treatments, that if work as advertised will be useful. Here is the site
http://techlinecoatings.com/hi-performance/index.html
http://techlinecoatings.com/hi-performance/index.html