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Sanding off the varithane(sp?)?

The poly finishes are very, very tough. Sanding is possible, but tends to take so much work as to be an unpleasant job, then you are faced with a lot of smoothing work. A couple of alternatives: (1) If you plan to paint the bass a solid color, there's no need to fully remove the poly - it's a great platform for another finish if you just rough it up (and patch any dings, etc) or (2) If you are really determined to get to bare wood, a heat gun will do the best, and quickest job for you. I recently refinished a Fender body whose poly-crud finish had been removed with a heat gun. After just a little touchup sanding, I had a bare wood surface to start from.
 
There's a significant risk of gouging the surface or changing the shape of the instrument while sanding if you're using a grit coarse enough to get he job done with alacrity, i.e., 40- or 60-grit. Coarse abrasive in a powered sander can ruin an instrument in a big hurry if you're not careful. Using 100-grit or finer can be slow sledding.

If you set up a worklight so it's shining parallel to the surface (as when shaping a surfboard), you'll be in a far better position to see exactly what you're doing and avoid mistakes .

If you know someone with a drum sander, and you're willing to pay to replace the abrasive, you can sand the front and back perfectly flat in mere minutes - after you've removed the majority of the old finish.
 

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