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You could always try a RUST CONVERTER type product. Decent auto stores will carry this, and it's about $3-5$ for a small bottle.
They suggest sanding before applying, since a lot of rust can hide under the paint in the surrounding area, but if you have very minimal rust (I can't see any in the picture) you can probably just apply the rust converter to the affected areas.
When the rust converter dries, it dries to a sandable, semi-gloss black finish.
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