I'm with Junk on this... a few years ago you could easily get away with a wet sand on factory paint if you were careful, but as more an more manufactures migrate to water based (environmentally friendly) paints and try to maximize profits be reducing overhead (translation: use less paint per car) the paint is so thin that sanding it is a risky and often time bad idea.
I was working on a black 2010 Altima maybe a month back... when it arrived the early morning sun was really hitting hard. On the door pillars you could see THRU the pigment. No joke... it was that thin that in harsh sunlight it was almost transparent. This was a fresh off the lot car... never been buffed, sanded, or repainted... the factory paint is just that thin. In shade you couldn't tell, but in direct sun it was obvious. The owner and I were both floored.
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