Does polymer clay crack after baking?

Polymer clay is a versatile and popular medium used by artists and crafters to create a wide range of projects. Baking polymer clay is a crucial step that transforms the material from a pliable form to a hardened, durable piece. However, there are instances where polymer clay may develop cracks after baking. In this article, we’ll explore the causes of cracking in polymer clay and provide insights into how to prevent this issue.

1. Insufficient Conditioning

Proper Conditioning:

The importance of thorough kneading:

One of the common causes of cracking in polymer clay is insufficient conditioning before shaping and baking. If the clay is not kneaded thoroughly to achieve a uniform texture, it may contain air bubbles or uneven areas that can lead to cracks during baking.

2. Overbaking

Baking Beyond Recommendations:

The impact of excessive heat:

Overbaking polymer clay can also contribute to cracking. Baking the clay at temperatures higher than recommended or for longer durations can cause the clay to become brittle and prone to cracking once it cools down.

3. Rapid Temperature Changes

Sudden Shifts in Temperature:

The effect of abrupt changes:

Exposing polymer clay to sudden temperature changes, such as placing it in a cold environment immediately after baking, can lead to cracking. Polymer clay needs time to cool gradually and stabilize after baking to avoid thermal shock.

4. Thin or Delicate Designs

Structural Integrity:

Challenges with fragile creations:

Thin or delicate designs made from polymer clay are more susceptible to cracking due to their reduced structural integrity. These pieces may not have the strength to withstand the stress of baking and cooling, leading to cracks or breakage.

5. Improper Techniques

Technique Considerations:

Using appropriate methods:

Using improper techniques, such as bending or flexing polymer clay while it’s still warm from baking, can cause stress points that result in cracking. It’s important to handle the clay gently and allow it to cool completely before applying any pressure or manipulation.

6. Prevention and Tips

Achieving Crack-Free Results:

Best practices for avoiding cracks:

To prevent cracking in polymer clay, make sure to thoroughly condition the clay, follow recommended baking instructions, avoid rapid temperature changes, be cautious with thin or delicate designs, and use proper techniques during handling and manipulation.


While cracking can be a concern with polymer clay, understanding the causes and implementing proper techniques can help you create beautiful and durable creations. By taking the necessary precautions and following best practices, you can enjoy successful and satisfying results, producing polymer clay projects that showcase your creativity and craftsmanship without the worry of unsightly cracks.

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