Which one Langka or Dr Colorchips?

Limeybastard

Long story short I managed to scratch my rear bumper about the size of a my white nail tip of my pinky finger. Damn that Z letter has sharp edges! First real scratch on my Zeee, least I was the purpotraitor and no one else.

The scratch has gone through to substrate, meaning its black plastic is visible.
Not sure which would work best, Langka or Dr Colorchips on this one. I used Langka back in England many years ago when it first came, was hard to get right but good thing about it was if you made a mistake you could easily take out the paint and start over. Never tried DC.