[Rockhounds] Re: grinding specimens for cabs, ...What coating to keep brittle material intact?

[Paintricks at aol.com]

Hello,
  I just acquired a cabbing machine and am learning to work  material.  While 
some material is easy to cut and polish(silica material),  some comes apart, 
like Malachite.
  What's a good coating to prep material like this to keep it together  when 
working with smaller or thinner  pieces?
  Thanks,
   Kevin
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