Sorry about your burned hand! The jeweler who trained me, said as he
showed me how to use a knife edge burr (looks like a bonesaw!): ‘Now don’t
slip and hurt that ring! Your hand will heal, but the ring won’t!’- so
hopefully your mld is okay.
About the wax to be removed from the rubber. Naptha is a common solvent
that dissolves wax. I don’t know if it effects the rubber, but you could
try submerging a little piece of rubber in the solvent to see if it will
attack it or not.
When handling Naptha, avoid breathing the fumes and skin contact. Use
ventilation. It is not the most dangerous of solvents, but it is more
dangerous than acetone.
Good luck, Tom Tietze
-The Artisan Workshop
Jewelry Creations & School