Why did my polymer clay crack after baking?

Polymer clay is a popular and versatile medium used by artists and crafters to create a wide range of intricate and detailed creations. However, one frustrating issue that can arise when working with polymer clay is the occurrence of cracks after baking. Cracking can be disheartening, but understanding the potential causes can help you prevent and address this issue. In this article, we’ll explore some common reasons why polymer clay may crack after baking and provide insights into how to avoid this problem.

Inadequate Conditioning

Conditioning is a crucial step in working with polymer clay, as it softens the clay and ensures that all the particles are properly mixed. If the clay is not thoroughly conditioned, it may contain air pockets or uneven areas that can lead to cracking during baking. Make sure to knead and manipulate the clay until it is smooth and pliable before beginning your project.

Thin and Uneven Sections

Polymer clay is more prone to cracking in thin or uneven areas. When the clay is too thin, it may not have the structural integrity to withstand the baking process. Additionally, variations in thickness can cause uneven stress during baking, leading to cracks. Be mindful of creating even and balanced thickness throughout your piece to minimize the risk of cracking.


Baking polymer clay at temperatures higher than recommended or for excessively long durations can cause the clay to become brittle and prone to cracking. It’s important to follow the manufacturer’s baking guidelines closely to ensure that your pieces are properly cured without being overbaked.

Rapid Temperature Changes

Quick and drastic temperature changes can cause polymer clay to crack. For example, placing hot polymer clay immediately into a cold environment or exposing it to drafts can result in thermal shock and cracking. Allow your baked pieces to cool gradually and naturally before exposing them to temperature changes.

Insufficient Support During Baking

When baking intricate or delicate designs, it’s important to provide proper support to prevent distortion or sagging during the baking process. If the clay is not adequately supported, it may collapse or deform, leading to cracks. Use armatures, supports, or molds to help maintain the desired shape of your piece while baking.

External Pressure or Impact

Cracking can also occur due to external pressure or impact on the clay, either before or after baking. Accidentally dropping or mishandling the piece can cause cracks to form. Handle your polymer clay creations with care to avoid putting undue stress on them.


In conclusion, cracks in polymer clay after baking can be attributed to various factors, including inadequate conditioning, thin or uneven sections, overbaking, rapid temperature changes, insufficient support, and external pressure. To minimize the risk of cracking, ensure proper conditioning, maintain even thickness, follow baking guidelines, allow for gradual cooling, provide adequate support, and handle your creations with care. By understanding and addressing these potential causes, you can create polymer clay artworks that are less likely to crack and achieve the beautiful and lasting results you desire.

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