No paint manufacturer or product manufacturer that I have ever spoken to or articles from them which I have read on this subject have ever suggested OEM paints to be wetsanded.
I have never heard anyone from 3M or Meguiars suggest a new car be wetsanded just because it has orange peel. They make sanding papers first for the bodyshops which are sanding re-paints not for detailers to knock down orange peel. They make papers for professional detailers to remove runs, sags, dust nibs and yes orange peel, on re-paints, not OEM paints.
I have no idea why the sudden fascination with wetsanding among people....I mean it's time consuming, there is no room for error, it's messy and it's not fun...make a mistake and then the $600 you are getting won't be delivered to you but instead you'll have to pay out $600 or more to a body shop for a re-paint, the car won't ever be the same, it decreases in value and good luck trying to convince the owner you can detail it for them.
The new ceramiclears have an even lower tolerence when it comes to error as their clears are thinner. My advice is don't do it unless you warn the client of all the risks and the risks surely outweigh the benefits.
Anthony