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Phosphoric Acid is called 'Metal Etch and Prep'. I use a garden sprayer, dilute it with some water and spray the bare metal. The Phosphorus reacts with Magnetite and Ferric Oxide and forms a Iron Phosphate compound. Use primer after cleaning with Phosphoric Acid, then paint.
A word of caution... a number of years ago I was spraying phosphoric acid at a rusty frame and managed to walk through a cloud of the stuff (without a mask). Yes, I inhaled . I recommend that others do not do likewise. It works great, but learn from my painful mistake.
Good judgement comes from experience... experience comes from poor judgement.
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