4 Answers

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always scrape off as much loose rust as you can,,paint on some rust converter,the converter converts the rust into a  chemical you can paint over,thus getting rid of rust

put some Coke on it and scour it with a Brillo pad.

I like rust and have 20-5 gallon buckets full of rusting iron with salt brine and water to help it all dissolve.  When it is done rusting all that junk to pure liquid rust I'll dry it to a nice brown powder and pour the dry powder into my kiln repeatedly until it turns completely black. Black iron rust can be used to make paint, ink or dye. If you have as much as I do, you can mix in powdered aluminum until the mix is turning a bit grey in color. I like to mix in various mixes of metals and powders to produce a resulting metal for one of a variety of possible results. The powders are ignited with a magnesium match resulting in a chain reaction of metals and compounds releasing intense heat in the process and filling the mold with molten metals. The crude process is called "Thermite welding or casting." But that is just the simplest form of a process that can be quite elaborate and yielding of high quality metal products.