You obtain a Trading Paint skill when the side of your car slightly touches the side of another car without wrecking it
You have to gain some speed but then again not too fast either so you can better control your car.
Best done on the interstate highway imho.
Good thing to know is that even if you lose your 'combo' by hitting another car too hard or such, you won't lose the challenge progress.
Meaning, you don't have to "bank" the Trading Paint skill in order to make it count.
Once it ("Trading Paint") appears on screen, you may consider it as granted!
Alright, I promised earlier today that I'd try to upload a vid if I could find the time for it.
Which I did, so here it is...(Please note : the clips were recorded by Xbox One's Game DVR. Therefore, any eventual unlocking achievements appeared on my screen were not registered by the Game DVR)PS: I turned off the in-game's soundtrack. YouTube kept annoying me earlier today about friggin' copyrights on other vids I made.
Stick to the explanation in the beginning and you should be fine.
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Any suggestions to improve the guide are welcome.