I'll go along with Grandpastruck on the Eastwood stainless steel paint. I have a 1940 F**d that I rebuilt back in the early 1980s. I cleaned and painted the cast iron manifolds and the exhaust pipes. I do not have a speck of rust on either. I do keep the car inside and do not drive in the rain, so your results may vary depending on your driving. I have a 55 task force I am working on now that needs an engine rebuild soon. I plan on cleaning up the tube headers that are on it now and painting with Eastwood. I have no doubts that the ceramic coating is much better, but for the money I'll stick with Eastwood.
Hugh