Cigar Ash and water does work but a stronger formulation is one I got off the net from a person who did some research into the various formulations. 2 parts plaster of Paris. 1 part activated charcoal powder and 1 part normal table salt. (the ingredients are all food safe unlike some commercial fire brick mortar I know has been used in the past) Mix with a little water to make a mud or thinner if you wish to coat the walls of bowls (it does a wonderful job of repairing cracks and hotspots) and it goes very very hard, dries charcoal grey and imparts no taste to new tobacco. The cigar Ash and water formulation tends to be a little softer. Also if you don't smoke cigars... Difficult to get. I believe Aristocob also sells his own formulation as well.
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