Re-painting black exterior trim

The used 2007 CX-9 we bought has some scuffs in the black portion of the rear bumper.. not sure what from, could be anything. I'd like to touch it up myself, but I'm unsure what to use that matches the rest of the black trim. I'll probably sand it down first to smooth out the scuffs, and then tape everything else off and re-spray the entire black trim area on the rear bumper, up to where it meets the rest of the body above the rear wheels.
 
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