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Most auto parts store will carry a product called Trim-Paint. It's made just for doing such repairs as yours. I'd carefully mask the area and sand with 400 grit wet/dry paper working wet. then re-shoot the whole strip from top to bottom. First coat should be a light dusting or speckling (tack coat), followed by about 3 medium (wetter) coats. I'm sure it will come out fine. Sorry, but I have no knowledge of the touch-up paint in question.