If it was mine. I'd lightly brush the area with a wire brush to remove any loose material.
Then I'd inspect for any rust. Ifany is present sand only htose areas down to bare metal (ish) treat rust with stuff bought at Halfords eg Kurust or something along those lines.
The one I have turns black when it dries, ask the teenager behind the counter.
Then quick spray over the now non rusty areas with acid etch primer (masking off bits you don't want primed). Then I'd apply two generous brushed coats of Black Hammerite....or any colour you like really. Don't buy the spray version it goes everywhere. This could be all you need to do BUT.....
Use an old throwaway paintbrush for the Hammerite as it's a swine to get out.
If any treated area shows much from the side I might then the next day very lightly rough up the surface with some very fine sandpaper and once you wipe the surface with a clean white cloth (dampened with meths - allow to dry) spray the body colour on as a topcoat purely for cosmetic reasons. Should cost you no more than a weekend and oohh say £20?
Should last several years.
Hope that helps, but someone may have a better treatment...thats just what I used to do to my old Princess.
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