1. In a wheel barrow mix adobe by combining 5L clay with the previous recipe for refractory mortar (70% clay soil, 20% sand, 10% cement).
2. Smooth this in an even layer over the entire pizza oven. This gives a nice uniform surface to attach the nest layer to and begins to provide some insulation. Work with a trowel for even and smooth coverage.
3. Dry this layer for at least 24 hours. Use tarpaulin to protect from rain. Again lighting a small fire in the oven after a good period of drying time will help rid excess moisture.
NB: This layer may crack while drying due to the high amounts of clay. It will not make a difference to the final structure.
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