Does polymer clay harden in air?

Polymer clay is a popular and versatile crafting material known for its ability to be molded, sculpted, and baked to create a wide range of creative projects. One common question that arises is whether polymer clay hardens when exposed to air alone. In this article, we’ll delve into the curing process of polymer clay and explore whether it hardens in the air or requires baking for full solidification.

1. Initial State of Polymer Clay

Malleable and Flexible:

Soft texture of raw polymer clay:

When polymer clay is freshly sculpted or molded, it has a soft and malleable texture that allows for easy shaping and manipulation. At this stage, polymer clay is not fully solidified and does not have the hardness and durability characteristic of the finished product.

2. Curing Process

Baking for Solidification:

Role of heat in curing polymer clay:

Polymer clay requires heat to undergo a chemical reaction that leads to its curing or solidification. This process is typically achieved through baking the clay in an oven at the recommended temperature and duration specified by the manufacturer. During baking, the heat causes the plasticizers in the clay to evaporate, leading to the hardening and strengthening of the material.

3. Air Drying vs. Oven Baking

Air Drying Limitations:

Lack of sufficient curing:

Unlike some other types of clay, polymer clay does not harden or cure sufficiently through air drying alone. While allowing polymer clay to sit exposed to air may result in some degree of firmness over an extended period, it will not achieve the same level of hardness and durability as properly baked polymer clay.

4. Importance of Baking

Ensuring Structural Integrity:

Full solidification through baking:

To achieve the desired level of hardness, strength, and durability in polymer clay, it is essential to follow the recommended baking instructions provided by the manufacturer. Proper baking ensures that the polymer clay undergoes the necessary chemical changes for full solidification, resulting in a finished product that can be handled, worn, and enjoyed for various creative purposes.


Polymer clay does not harden in the air like some other types of clay. While the raw clay may firm up slightly when exposed to air over time, true curing and solidification occur through the baking process. Baking polymer clay at the appropriate temperature and duration is crucial for achieving the desired hardness and durability, allowing crafters to create long-lasting and beautifully crafted projects that showcase the versatility and potential of this unique material.

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