Got the stuff at Leslie Ceramics. It was suggested to me to add in some Zirconium Silicate by a friend who is a ceramics guy. So I got 10 pounds of that as well.
Rethought the couscous and went with millet seed instead. It was like $1.50 / pound at Whole Foods Market. I think the millet will expand less as the clay is drying. It still has the consistently round quality of the couscous and will burn out just fine. I'm thinking about 25% by volume right now.
Hopefully will make some molds tonight and get one bottom panel formed up and drying as a test. I'm going to split each side into at least two sections to allow for expansion and mitigate repair problems down the road.
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