Measure how thick 350z paint and compare it to other similar cars and you will find there is a significant amount of paint not there on the 350zs i.e. 20/30%+
Ok , well how come my newly painted bumper with at least 3 extra coats still chips?? just the same as on other cars I have owned..I'm convinced its just the shape and lowness of these sort of cars,, Stone chips are something we will have to live with .Mind you like I said before if you drive like an old woman you wont pick up as many..
I see this phenomenon a lot on motorcycles, some are plastered with chip while others are mint ,all down to the style of driving, what roads are being used regularly and if the rider has been in fast company I think on the Zeds if you use the motorways regularly chips are going to be a way of life