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pb[_2_]

In article ,
says...
This is just a general interest question. A few weeks ago I purchased the
Beall Bowl polishing system and am very pleased with the performance. In
the process of polishing some bowls, I found one that for some reason or
other I didn't have the inside sanded very well prior to finishing. I can
go back and re-sand the inside if I so choose but this brought a thought to
my mind. It is not easy to sand inside bowl surfaces with most sanding
devices (electric drill, dremel, etc.) I wonder how it would work if one
took one of the Beall balls, moistened it with water and added some fine
abrasive and use this to sand the interior of bowls. It is relatively easy
to get very fine abrasives from places that sell them to be used in rock
tumblers. Anyone tried anything like this?

I reckon you would fill the grain with abrasive and wood dust in a nice
slurry and have the devil's own job trying to get it out.