I'd imagine a good catalyzed paint would work best.
You could get something like this:
https://www.amazon.com/UCS-Hot-Rod-S.../dp/B0186NI7LQ
Or a local auto paint store, could probably mix you something where they add the hardener in the store and have it ready for you to spray.
If you are getting really fancy there is an air dry Cerakote that would probably work well. I had a master cylinder done recently with the air dry product that has held up agains brake fluid and brake cleaner.