newbroom,
I once read an article (don't remember where) about using BBQ grill ash and water to make a paste to use as pipe mud.
I tried it, and found it to work well. Sets up like concrete. I've treated several of my MM cobs and hardwoods. You might try that instead of plaster of Paris, or do some each way and find out what you like better.
BTW - I sifted my ash through an old flour sifter, just to get the chunks out. I don't know if that's necessary, but I found the end result easier to work with.
I once read an article (don't remember where) about using BBQ grill ash and water to make a paste to use as pipe mud.
I tried it, and found it to work well. Sets up like concrete. I've treated several of my MM cobs and hardwoods. You might try that instead of plaster of Paris, or do some each way and find out what you like better.
BTW - I sifted my ash through an old flour sifter, just to get the chunks out. I don't know if that's necessary, but I found the end result easier to work with.