Don, I use this Rusteloum Rust Reformer. My local Menards and Ace Hardware carry it. Cheaper at Menards. But this stuff works very well.
rustoleum.com/product-catalog/consumer-brands/stops-rust/rust-reformer I remove as much of the surface rust as I can with a wire brush, grinder, or sandpaper first, then I give the metal a wipe down with some paint thinner to remove any dirt/grease/oil. I spray the reformer, let it dry 24 hours, then top coat it.
It's worked pretty well for me. Perfect for bracketry, chassis parts and things that are well suited to be painted with a rattle can.
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