Why is my polymer clay so hard?

Polymer clay is a versatile and popular medium used by artists and crafters to create a wide range of projects, from sculptures and jewelry to decorative items. However, there may be instances where you encounter polymer clay that is unusually hard and difficult to work with. In this article, we’ll explore the potential reasons why your polymer clay might be too hard and offer solutions to address this issue.

Understanding Polymer Clay Hardness

Polymer clay typically starts out as a soft and pliable material that can be easily manipulated and shaped. However, certain factors can lead to polymer clay becoming harder than desired:

  • Aging: Over time, polymer clay can naturally become harder due to the evaporation of plasticizers, which are the additives that give the clay its flexibility.
  • Exposure to Air: Leaving polymer clay exposed to air for extended periods can cause it to dry out and become harder.
  • Incorrect Storage: Storing polymer clay in direct sunlight, extreme temperatures, or in an open container can lead to hardening.
  • Excessive Baking: Baking polymer clay for longer than necessary or at higher temperatures than recommended can result in over-curing and increased hardness.
  • Old or Expired Clay: Using polymer clay that has expired or is past its prime can contribute to increased hardness.

Solutions to Soften Polymer Clay

If you find that your polymer clay is too hard, there are steps you can take to soften it and make it more workable:

  • Kneading: Knead the clay thoroughly between your hands to warm it up and redistribute the plasticizers. This can help restore its pliability.
  • Additives: Some artists use additives like clay softeners or mineral oil to restore the flexibility of hard polymer clay. Follow the manufacturer’s instructions when using these additives.
  • Blending with Softer Clay: Mix the hard clay with a softer or newer batch of clay to achieve the desired consistency.
  • Baking: If the clay is over-baked or has been exposed to high temperatures, you can try rebaking it at a lower temperature for a shorter period of time. Keep a close eye on the clay while baking to prevent further over-curing.

Preventing Polymer Clay Hardness

To prevent polymer clay from becoming excessively hard, consider the following tips:

  • Proper Storage: Store your polymer clay in a cool, dry, and airtight container to minimize exposure to air and moisture.
  • Use Fresh Clay: Use polymer clay that is within its recommended shelf life to ensure optimal pliability.
  • Follow Baking Instructions: Always follow the manufacturer’s baking instructions for temperature and duration to prevent over-curing.
  • Work Efficiently: Plan your projects and work efficiently to minimize the amount of time the clay is exposed to air.


In conclusion, polymer clay can become hard for various reasons, including aging, incorrect storage, and excessive baking. However, with proper care, storage, and handling, you can maintain the pliability and workability of your polymer clay. If you encounter hard polymer clay, techniques such as kneading, additives, and blending can help soften it and restore its flexibility. By understanding the factors that contribute to polymer clay hardness and implementing preventive measures, you can continue to enjoy the versatility and creative possibilities that polymer clay offers.

Rate article
Add a comment