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Phosphoric acid to stop rust

I've read about this pertaining to Ospho, but the product I have a is a milkhouse cleaner with a 48% concentration. I am thinking to mix it 60/40 with water, as I need about 4 gallons in a 5 gallon pail to dip the dogleg of a front fender in. About how long should this sit and then do I rinse it as good as possible with a hose and nozzle ? It will be nearly impossible to get a direct stream between the support and skin. After the rinse do I dip it to wet it again and then let it air dry or blow dry ? After it is dry, with whatever method is recommended, I can then apply the 6610 primer without any further actions ?
Sorry for being a newbie, but I'd like to only do this once and correctly.
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