I've seen folks use 320/400 for final sanding, but I use 600 then do a final with 800-1000. I stopped using 3m paper for exactly the same reason Pat stated and went to either Norton or Mirka($$). For whatever reason, 3m has changed their manufacturing processes and it doesn't hold up.

A trick or two, tear the paper rather then cut it (fold towards the grit first then tear), another, soak the paper for about 30 minutes in a half bucket of water with a little squirt of Dawn dish detergent, then use a spray bottle with some of that kind of mixture to keep the surface wet while you sand. To me, it works slick!!!

I have sanded BC but you do chance making thin spots that show through, especially grays and silver (of course there can also be tiger stripes in those colors as well)