Does polymer clay crack easily?

Polymer clay is a versatile and popular medium for crafting and sculpting, but like any material, it has its own unique characteristics and considerations. One common concern that artists and enthusiasts may have is the potential for polymer clay to crack. In this article, we’ll delve into the factors that can lead to cracking in polymer clay and explore effective strategies to prevent it.

1. Thickness and Evenness

Uniformity Matters:

Exploring the role of thickness:

One of the primary factors that can contribute to cracking in polymer clay is uneven thickness. Thicker sections of clay may not cure uniformly during baking, leading to stress points that can result in cracks. To prevent this, ensure that your clay is rolled out to a consistent thickness across the entire piece. Using tools like rolling guides or spacers can help you achieve an even thickness and reduce the likelihood of cracking.

2. Overbaking and Temperature

Tempering the Heat:

Understanding the impact of baking:

Overbaking polymer clay or exposing it to excessive temperatures can cause it to become brittle and prone to cracking. Follow the manufacturer’s recommended baking times and temperatures for the specific brand of polymer clay you are using. Baking within the recommended range ensures that the clay cures properly without becoming overly fragile. Additionally, avoid sudden temperature changes, as this can create stress within the clay and lead to cracking.

3. Design and Structural Considerations

Stress Points and Support:

Addressing structural issues:

The design and structure of your polymer clay creations can influence their vulnerability to cracking. Thin and delicate parts, unsupported spans, or sharp edges can become stress points that are more susceptible to cracking. Reinforce areas that may experience stress by incorporating armatures, internal supports, or other reinforcement techniques. This can help distribute stress more evenly and reduce the risk of cracks forming.

4. Conditioning and Workability

Flexible and Prepared:

Importance of proper conditioning:

Properly conditioning polymer clay before use is essential for minimizing the risk of cracking. Conditioning involves kneading and warming the clay to make it soft, pliable, and free of air bubbles. Air bubbles trapped within the clay can expand during baking, leading to cracks. Thoroughly condition your clay to ensure it is workable and ready for sculpting. When joining different pieces of clay, ensure they are well-blended and securely attached to reduce weak points.


While polymer clay is a versatile and enjoyable medium, it’s important to be aware of the factors that can contribute to cracking and take steps to prevent it. Ensuring even thickness, following proper baking guidelines, addressing design considerations, and thoroughly conditioning your clay are all essential elements in creating crack-resistant polymer clay creations. By understanding these factors and implementing best practices, you can enjoy the process of working with polymer clay while minimizing the risk of cracking and achieving durable, beautiful results.

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