How to Keep a Clay Model Hard
- 1). Preheat an oven to 230 degrees Fahrenheit.
- 2). Line a baking tray with aluminum foil.
- 3). Place the clay model on the aluminum-lined baking tray.
- 4). Place the baking tray into the oven once it has preheated.
- 5). Monitor the clay model carefully as it dries, watching as wet spots disappear. Remove the clay model once it has completely dried. Don't allow the piece to dry in the oven for more than 30 minutes.