On a side note: the nitro finish on my '05 P5, aka Blackie, had gone from matte to gloss from playing wear -- happened quickly in my case, because I only had the one Sadowsky and of course it was my #1 bass! So, a couple years ago I removed much of the nitro with 300 grit sandpaper. Just thought I'd post a comparison pic with my October 2010 Sadowsky MM5. The difference is more dramatic in person, but you get the idea:
I realize some folks don't like the look of grungy maple, but it doesn't bother me at all, and far more important to me is the feel. I completely agree with Roger:
I'm sorta tempted to sand my 2010 Sadowskys, but they're not super glossy yet (I rotate all three Sadowskys), so for now I'll let nature run its course.
P.S. The finish on Blackie was coming off naturally. Here's a pic of the treble side of the neck a couple years before sanding. The wear might be from my wedding ring... or maybe not: that bass got a LOT of playing time.