Clay Preservation Tips 1. Clay air-dries naturally. Take only the amount you need and seal the unused portion tightly for storage. 2. If left exposed to air for too long, peel off the hard surface film. Knead the clay a little, then wrap it in plastic wrap and keep kneading until it regains its softness. 3. Seal the clay in plastic wrap and place it in the refrigerator's crisper drawer. When taking it out, let it sit at room temperature for 5-10 minutes before use. 4. If the clay is dry, add a f