What can I put on clay so it won’t crack?

Creating intricate and beautiful designs with polymer clay is a rewarding and creative endeavor. However, one common concern among polymer clay enthusiasts is the potential for cracks to develop during the curing process or over time. To ensure the longevity and integrity of your polymer clay projects, it’s important to take preventive measures to avoid cracking. In this article, we’ll explore techniques and materials you can use to minimize the risk of cracking and create durable, flawless creations.

1. Proper Conditioning

Properly conditioning your polymer clay is a fundamental step in preventing cracks. Conditioning involves kneading and softening the clay to make it pliable and more resistant to cracking. To achieve this, use your hands or a dedicated clay conditioning machine to thoroughly work the clay until it becomes smooth and free of air bubbles.

2. Avoid Overworking

While conditioning is essential, overworking the clay can have the opposite effect and make it more prone to cracking. Be mindful of excessive manipulation and kneading, as it can cause stress on the clay’s structure. Work efficiently and avoid prolonged handling to prevent potential cracks.

3. Use a Release Agent

A release agent, such as water, can help reduce friction and stress on the clay, minimizing the risk of cracks. Lightly mist your hands, tools, or work surface with water to create a barrier between the clay and other surfaces. This can help the clay move more smoothly and prevent sticking, reducing the likelihood of cracks.

4. Support During Baking

Providing proper support to your polymer clay creations during the baking process is crucial. Use props or armatures to support delicate or thin areas that are prone to cracking under their weight. Elevating the clay slightly during baking can help distribute heat evenly and prevent distortion or cracking.

5. Slow and Even Baking

Baking your polymer clay at a slow and even temperature is essential to prevent cracking. Rapid temperature changes can cause stress on the clay and lead to cracks. Use an oven thermometer to monitor the temperature and ensure that it remains consistent throughout the baking process.

6. Cooling Gradually

After baking, allow your polymer clay projects to cool gradually inside the oven. Avoid removing them from the oven while they are still hot, as the sudden temperature change can cause cracks. Allowing the clay to cool slowly helps it stabilize and reduces the risk of cracking.

7. Proper Storage

Storing your finished polymer clay creations properly can also contribute to preventing cracks. Avoid exposing them to extreme temperature changes, humidity, or direct sunlight, as these factors can affect the clay’s integrity over time. Store your projects in a cool, dry place to maintain their structural stability.


Preventing cracks in polymer clay requires a combination of proper conditioning, careful handling, support during baking, and thoughtful storage. By following these techniques and incorporating release agents, you can minimize the risk of cracks and create polymer clay projects that are not only visually stunning but also structurally sound and durable. With attention to detail and adherence to these preventive measures, you can enjoy crafting with polymer clay and showcase your creations with confidence.

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