On their website TTI headers they offer for the newish cars are SS. Wonder how much time in their week is spent dealing with customer issues regarding these non-permanent coatings? If you own this company do you continue down this path, or do you add SS as an optional material choice and mark the cost up to cover it?

VHT is paint only. You could derust the funny spots on those, gently scotchbrite the remaining good areas, and then put VHT header paint right over the ceramic if you wanted to. It will adhere just fine. It's just not a life long solution, and the finish will be flat vs shiny is all.