Research a product called POR 15. It is damn near bullet proof and is used up north on hiway equipt. where corrosive salt is on the roads. Use a respirator when applying. Can be brushed or sprayed. I have used it many times in vintage car restorations.

Dear Alcohol, We had a deal where you would make me funnier, smarter, and a better dancer... I saw the video... We need to talk.