How long does it take polymer clay to harden?

The time it takes for polymer clay to harden depends on the curing method you are using—air drying or baking—and the size and thickness of your project. Here’s what you need to know about the hardening process:

Air Drying

Air dry polymer clay, also known as non-baking polymer clay, cures over time as it is exposed to the air:

  • Small and thin creations may dry and harden in a matter of hours to a few days.
  • Larger or thicker projects may take several days or even weeks to fully cure.
  • Factors such as humidity and ventilation can impact the drying time.


Baking polymer clay accelerates the curing process and provides a more reliable and efficient method of hardening:

  • Follow the manufacturer’s recommended baking temperature and time for the specific type of polymer clay you are using.
  • Most polymer clays require baking at temperatures between 265°F (129°C) and 275°F (135°C) for about 15 to 30 minutes per 1/4 inch (6mm) of thickness.
  • Thicker pieces may require longer baking times to ensure complete curing.

Testing for Hardness

To determine if your polymer clay creation is fully hardened:

  • Wait for the recommended curing time to elapse.
  • Test a small, inconspicuous area of the clay by gently pressing your fingernail into it. If the clay feels firm and doesn’t indent easily, it is likely fully cured.
  • Keep in mind that the surface of the clay may harden faster than the interior, so ensure that the entire piece is adequately cured.

Whether you choose air drying or baking, proper curing ensures that your polymer clay projects achieve the desired hardness and durability for long-lasting enjoyment.

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