JB weld removal

If it's a fair-sized lump, you may be able to chip most of it off with a sharp chisel. It probably wouldn't hurt to throw it in the freezer for a while first. You'll probably end up sanding/filing/grinding to get it all off.
 
JB Weld FAQ Website

A: When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600º maximum temperature threshold.
http://www.jbweld.com/faqs/

Since G10 has an operating temp at half of that, I think grinding & sanding is your only bet.
 
Over a period of time, vibration will do it. JB Weld has failed on almost every automotive fix I've tried with it...
 
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