I have used Ospho surface treatment followed by appliance epoxy paint in rust prone areas to good result..
Appliance epoxy paint is glossy as heck, and will look good (and is tough) for a short while. The problem is, it’s NOT UV resistant, and will break down quickly in sunlight. Interior-great. Exterior-not great.
https://www.rustoleum.com/en/product-catalog/consumer-brands/specialty/appliance-epoxy-spray
