Nail Polish is not designed to last long ... after all it's got to be taken off every couple weeks and redone.
Better to go with a industrial type Urethane clear coat of some type, one that can stand heat, salt, road grim and water. Polish the bolt heads first, then coat and bake.
Might work?
Or, you could do what I do and just wipe down things or spray with WD40 once a week. Pretty good against corrosion but smokes once hot.
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