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Step 7Cover the Oven in Fireclay
Mix up a batch of fireclay (available at pottery and clay suppliers) and sand, with water.
Apply this mixture to the outside of the oven, concentrating it on all the gaps between bricks. The idea is that this will help keep the smoke, and to a lesser degree, the heat, inside the oven. Be liberal with it. You'll have plenty.
We found a few spots on the back of ours that didn't get enough fireclay. And as Thomas noted:
"Clay/Sand – we did a 1:1 mix. It seems very grainy and brittle – lots of cracks. May try another batch with less sand and put over the current one."
Apply this mixture to the outside of the oven, concentrating it on all the gaps between bricks. The idea is that this will help keep the smoke, and to a lesser degree, the heat, inside the oven. Be liberal with it. You'll have plenty.
We found a few spots on the back of ours that didn't get enough fireclay. And as Thomas noted:
"Clay/Sand – we did a 1:1 mix. It seems very grainy and brittle – lots of cracks. May try another batch with less sand and put over the current one."
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