Clayette is available in soft, medium and hard. On a scale of 1-10 the soft would be a 2, the medium a 4 and the hard would be a 6.
115°F / 46°C
Wash hands with soap and water after use.
Using small amounts of citrus-based solvents, lighter fluid, latex paint removers, turpentine or mineral spirits as a lubricant on the surface of the clay will help to attain a smooth surface.