Yeah... I forgot about the "tack and wack". A tack coat is a "light dusting" of paint. It dry's in about 1 minute so by the time you are done putting on the tack coat on all the pieces its time to paint for real.
You can sand above 600 but the mechanical bond that the paint would have would be very week. You would pretty much be relying on a chemical bond at that point.
the guy that taught me how to paint, he would just sand with 400 ... untill he started seeing scratches in is finished paint jobs. now he sands with 600.
I did a car once where I sanded the primer with 800 .... It turned out flawless but I don't know if that was such a great idea... time will tell! its been a year and the car still looks beautiful.
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