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I don't have a lot of experience with POR15, but I don't believe it will convert the rust. Use a wire wheel, then a rust converter(the stuff you referred to that turns it black) & then paint it. The rust converter is basically a phosphoric acid solution that eats away at the oxidation. I've used all kinds & one of the most effective I've seen is actually available over the counter, I got some at auto zone. I believe its made by Kleen Strip.
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