Hammerite do a good one, also available as a green gel which may be better as it will stay in place - may not be as being a gel it's thicker so may not get where you want it! Only products I'd recommend, as IMHO their paint is c**p.
One thing to be aware of is that there are rust REMOVERS, which these are, and also rust CONVERTERS which do not remove it but convert it to iron phosphate, so may not be the sort of product you want.
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