IIRC you unlock it by finishing a karting event.
Thanks.

ah damnm, i hate the kart event lol, its so boring and easy .. il finish that today than so i can mat black my Civic mo hhahah

WTF .. when i saw some pictures i just thought that they are in real life .. especially the first one .. i think Im gonna buy PS3 only for GT5

You unlock paint by finishing the go kart, or you get a matte black paint car ??
lol I've only done beginners go kart.

Not my pic but..... check the rear camber of kombi yo!!

Oh god I love them for making certain old cars premium (the jap cars).
Kart event makes for some nice cash too

nice pics JHUI very nice drifts and lmfao at camber

Il take some pics of my new rider later 370z =D

glac

I think I got matte red from that challenge... though I think most of the paints you get are random. If you're lucky you may even get chrome paint from some challenges.

I need to take some pics of my exotics (Gran Turismo S, 458 Italia, Gallardo LP-560 and Veyron ).

Can top that!
I got matte black again, 60 cars in garage.

FUUUU I'm a much better photographer in real life then in Gt5.