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scratch on car, permanent marker a solution?

So some weedy plonker, when loading luggage into my boot failed to get it in one smooth motion and the suitcase caught on the "lip" bit underneath the boot. It's a plastic bumper, and now there's a massive scratch.

I tried black polish / black trim wax, it's not working.

My car is black, so I thought. Can I use black permanent marker to colour in the scratches? For example http://www.amazon.co.uk/Sharpie-Point-Permanent-Marker-markers/dp/B002LSNM68/ref=sr_1_1?s=officeproduct&ie=UTF8&qid=1408738590&sr=1-1&keywords=black+sharpie I mean, people either use permanent markers to do custom artwork on their car or I get google search results saying someone vandalised their car using permanent marker.

Or is "touch up paint" or spray paint the way to go? the bumper is plastic, not metal.