TS,
Since primer can already be seen, its unlikely tat mere polishing n buffing will enuf to cover it.

Best solution is to polish off as much foreign residues there, n depending on ur car n year or make, u might b able to buy those small touch-up paint (size similar to those ol poster color bottles) n cover d groove wit a caligraphy brush. Might not 100% b as good as new though.