I've got a few scuffs on my front bumper which need tidying up...one in the pic below:

Anyone used one of these?
http://www.ebay.co.uk/itm/271058659937?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Or can I get a touch up pen from BMW? I'm not going to go to the trouble of getting the whole bumper resprayed and could also use it to touch up a few other chips.
Gav

Anyone used one of these?
http://www.ebay.co.uk/itm/271058659937?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Or can I get a touch up pen from BMW? I'm not going to go to the trouble of getting the whole bumper resprayed and could also use it to touch up a few other chips.
Gav