I did this about 7 years ago. I had radiators in the bathrooms that had started to rust so rather replace them I painted them. I took the panels off and sanded them lightly with a 220 grit. I got off as much rust a possible. I ran down to NAPA and bought a bottle of Rust Stop and with a foam brush put that on rusty areas. (forms a chemical reaction with the rust and turns black). Primed just those areas (spray primer) and then painted them with Appliance Enamel (Rust Oleum). They look just a good as the day I painted them
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