What happens if you bake polymer clay too long?

Baking polymer clay is a critical step in the crafting process that transforms the pliable material into a solid and durable form. However, it’s important to follow the recommended baking times and temperatures to ensure the best results. Baking polymer clay for too long can have unintended consequences that affect the appearance and quality of your creations. In this article, we’ll explore what happens if you bake polymer clay for an extended period and how to avoid overbaking.

1. Discoloration

One of the noticeable effects of overbaking polymer clay is discoloration. Polymer clay can begin to darken or change color if exposed to high temperatures for too long. This can be especially pronounced in lighter or translucent colors, leading to a less vibrant and less appealing finished product.

2. Brittle Texture

Overbaked polymer clay can become brittle and more prone to cracking. The excessive heat causes the plasticizers in the clay to evaporate, resulting in a harder and less flexible texture. This can make the clay more fragile and susceptible to breakage, especially in thinner or delicate areas of your project.

3. Burned or Scorched Appearance

If polymer clay is baked at excessively high temperatures or for an extended time, it can develop a burned or scorched appearance. The surface may become discolored, blackened, or charred, which is particularly noticeable on lighter colors. Burned areas can also affect the overall aesthetics of your creation.

4. Warping or Deformation

Overbaking can cause polymer clay to warp, distort, or lose its original shape. The excessive heat can cause the clay to soften and become malleable again, leading to unintended changes in form or structure. This is particularly problematic for projects that require precise shapes and dimensions.

5. Unpleasant Odor

During the overbaking process, polymer clay may emit an unpleasant odor. This odor is a result of the chemical reactions taking place at high temperatures and can linger even after the clay has cooled. It can be unpleasant to work with and may affect the overall enjoyment of your crafting experience.

How to Avoid Overbaking

To prevent overbaking polymer clay, follow these guidelines:

  • Read Instructions: Always read and follow the manufacturer’s instructions for baking times and temperatures specific to the brand of polymer clay you are using.
  • Use an Oven Thermometer: Use an oven thermometer to accurately monitor the temperature inside your oven. Make sure it matches the temperature indicated in the instructions.
  • Check for Curing: Focus on curing the clay fully rather than baking it excessively. The goal is to achieve the desired hardness without subjecting the clay to prolonged high heat.
  • Avoid High Temperatures: Avoid using temperatures higher than recommended, as even a small increase can lead to overbaking.
  • Test and Monitor: For new projects or unfamiliar ovens, consider baking a small test piece before baking your main project. This allows you to gauge how the clay reacts to your specific oven and settings.


In conclusion, overbaking polymer clay can result in discoloration, a brittle texture, a burned appearance, warping, deformation, and an unpleasant odor. To ensure the best results and preserve the quality of your polymer clay creations, it’s crucial to follow the recommended baking times and temperatures provided by the manufacturer. By practicing proper baking techniques and closely monitoring your projects, you can achieve beautiful, durable, and well-cured polymer clay pieces that showcase your creativity and craftsmanship.

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