Plastic bumpers are a pain, its unlikely you'll do a good job. To do the job properly, you'll need to blend a large area, a plastic primer, followed by at least two coats of spray paint followed by top coat, rubbing down between each coat, and cut only after a few days when the top coat is hard.
If you just want to touch up with a brush, clean the area thoroughly with solvent to remove wax, apply paint generously and let the paint dry for a couple of days, then cut it back, blow over with top coat lacquer, leave for a week then cut to polish.
It'll probably look a bodge, a full respray is the only way to get a good finish.
Why not just stick a GB badge or other sticker over it? A couple of strips of hi-vis reflective tape may even look good.
If the cars black, then black tape, only you'll notice it there.
Edited by brum on 27/03/2015 at 22:32
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