Quick Answer
COIL METHOD EFFECTIVENESS FOR LARGE POTS: The coil method is effective for creating large pots, but it can be challenging to achieve consistent results and structural integrity. With proper technique and clay selection, however, it is possible to create large, functional pots using this method.
Selecting the Right Clay
When creating large pots using the coil method, it’s essential to select a clay body that can withstand the stresses of size and firing. Look for clays with high plasticity and strength, such as those with a high silica content (around 70-80%). A well-balanced clay body with a moderate level of moisture (around 50-60%) will also help to prevent cracking and warping during the drying and firing process.
Building and Shaping the Pot
To build a large pot using the coil method, start by preparing a sturdy base coil, typically around 1-2 inches in diameter and 6-8 inches long. Apply a thin layer of slip to the coil and attach it to the base, gradually building up the walls of the pot in a spiral fashion. Use a combination of gentle pressure and subtle manipulation to shape the coils into a symmetrical and balanced form. As you build, maintain a consistent thickness of around 1/4 inch to ensure even drying and firing.
Pit Firing and Waterproofing
Once your pot is complete, it’s essential to fire it in a pit kiln to achieve the desired hardness and waterproofing. A well-planned firing schedule, typically around 20-30 minutes at temperatures between 1000-1200°F (538-649°C), will help to transform the clay into a durable and watertight material. To enhance waterproofing, apply a layer of natural wax, such as beeswax or plant-based resin, to the interior of the pot before firing. This will help to seal any microscopic pores and ensure a watertight seal.
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