I would spray it with clear Imron by Dupont. It’s super hard and I’d say it’s probably one of the best paints out there for putting up with weather, oxidation, chemicals, etc. It’s expensive and not easy to use, but for choice I might try it. My dad made a small dinghy for his boss just to put champagne and ice in. He painted the boat with Imron.

David L. Whitehurst