Thank you for the enquiry, we would not recommend an aerosol paint for this application, the film build from an aerosol is thin and for the expected use on a bench it would not last long.

Assuming the iron bench is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Rust-Oleum 3369/3380 CombiPrimer Anti-Corrosion followed by Rust-Oleum CombiColor Original.

This can be mixed to many RAL, NCS or BS colours in a satin or gloss finish.

This can be applied by brush, roller or spray application.