Can a stone be re-polished once it has been sealed with a silicon impregnator?
Yes, since polishing effects the surface of the stone only, polishing will not be effected. After polishing be sure to check the surface of the stone by performing an absorbency test. See question # 304 for instructions. If the original impregnator was applied sparingly it is possible for the polishing process to remove any sealing properties. It is always a good idea to re-apply impregnator after honing and/or polishing.