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Hard to recommend anything especially. Exterior metal work, especially black seems to be the worst for longevity. I've tried Hammerite in the past, brushed or sprayed. That lasted about 5 years. Now I'm trying priming with a dark grey tinted primer, it's a fairly specialised one from a firm called Ray Munn in Fulham. Then 2 coats of an acrylic topcoat.
I like Zinnser All Coat on wood or walls but not seen the long term results on metal.
As with all things decorating a lot depends on the preparation. Get rid of any flaking paint and key everything with sandpaper.
Airhead
I have a galvanized steel (I think) post, essentially a scaffold pole, holding the concrete porch/lintel above the front door up which needs repainting - what is my best bet for getting something to stick and stay on for @ 5 years + please?