Personally, I cannot understand why your going that route. Every black metal part on my CB400/4 is powder coated. It is so practical, fuel and brake fluid resistant and after doing 3.500 miles on her last summer, a quick wipe down with the baby wipes and she was as good as new again. Well, better actually as powder coat was not around in the early/mid seventies so I feel this finish is a vast improvement on the original finish. I have another bike that will have exactly the same treatment to ALL black parts as part of the restoration as I know it will last a very long time. The Hammerite will peel like a bad suntan, as I have unfortunately found to my cost in the past, if you get any brake fluid on it and any petrol will make the finish go like a sticky mess. each to their own though.