First degrease everything preferrably with a power washer and then use a power wire brush wherever you can to remove as much rust as you can. I would skip the phosphoric acid. It's just too messy,toxic and requires a lot of water to neutralize. Go right to the rust encapsulator and chassis black.You can skip the primer if you want.The chassis black goes on pretty thick unless you dilute it following Eastwoods instructions. You may get flash rust before coating if you try to do too much area at a time.
