Quick Answer
Coiled pots can be made airtight by applying a combination of techniques, including applying multiple layers of clay slip, compressing the coils tightly, and using a sealant such as beeswax or pine resin. A well-made airtight pot requires careful attention to detail and the right materials for the job. By understanding the properties of different clays and how to work with them, you can create a truly airtight pot.
Preparing the Clay
When selecting a clay body for your coiled pot, choose a type that is known for its plasticity and ability to hold a high water content. A good starting point is a clay with a high kaolinite content, as it tends to be more durable and water-resistant. Mix the clay with a small amount of water to create a workable consistency, typically 1 part water to 3 parts clay by weight.
Building the Pot
As you coil the pot, apply a thin layer of clay slip to each coil and press the coils together tightly to create a strong bond. This should be done in a slow, deliberate motion to ensure the coils are evenly compressed. Aim for a wall thickness of at least 1/4 inch (6 mm) to provide adequate strength and prevent cracking.
Sealing the Pot
Once the pot has been built and dried, apply a sealant to the interior and exterior surfaces. For a natural sealant, try using a mixture of beeswax and pine resin, applied in a thin layer using a brush or cloth. This will help to prevent water from entering the pot and create a durable, long-lasting seal. Alternatively, you can use a commercial sealant specifically designed for ceramics.
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