I have a patio table and 4 chairs made from metal that needs redoing.
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Rustoleum makes a great outdoor paint for metal furniture -- but the secret to a good paint job is adequate preparation -- Clean thoroughly ( pressure wash), remove all signs of rust - steel wool/sand paper will work; make sure furniture is 'sound' -- most paints today have a rust inhibitor built in -- but you could prime with Red Lead paint if you have to.
This is the paint I use on mine every time! I really like it, and it holds up for years.
https://www.youtube.com/watch?v=obl9eml60V0