Is polymer clay waterproof once baked?

Polymer clay is a versatile and beloved medium used by artists, crafters, and hobbyists to create a wide range of projects. Whether you’re making jewelry, sculptures, or decorative items, understanding the properties of polymer clay is essential for achieving the desired results. One common question that arises is whether polymer clay becomes waterproof once it has been baked. In this article, we’ll explore the waterproofing capabilities of polymer clay after baking and provide insights into its behavior when exposed to water.

The Baking Process

Polymer clay is composed of polymer particles, plasticizers, and pigments. When heated in an oven, the plasticizers soften and allow the particles to fuse together, resulting in a solid and durable object. The baking process is essential for curing the clay and achieving its final hardness and strength.

Water Resistance of Baked Polymer Clay

While baked polymer clay is relatively durable and stable, it is important to note that it is not completely waterproof. The level of water resistance or waterproofing can vary based on factors such as the type of polymer clay used, the baking temperature, the finish applied, and the specific application of the clay.

Factors Affecting Water Resistance:

  • Type of Polymer Clay: Different brands and formulations of polymer clay may have varying degrees of water resistance.
  • Baking Conditions: Proper baking at the recommended temperature and duration is crucial for achieving the clay’s optimal hardness and durability.
  • Surface Finish: Applying a sealant or varnish can enhance the water resistance of polymer clay by creating a protective barrier.
  • Intended Use: Polymer clay items that are intended for decorative purposes and minimal handling may be more water-resistant than items that are frequently exposed to moisture or wear.

Applying Waterproofing Measures

If you want to enhance the water resistance of your polymer clay creations, here are some measures you can take:

  • Sealing: Applying a waterproof sealant or varnish to the surface of baked polymer clay can create a protective barrier against moisture.
  • Finishing Techniques: Techniques such as sanding, buffing, and applying wax can contribute to a smoother and more water-resistant surface.
  • Avoid Submersion: While polymer clay items may be water-resistant, it’s best to avoid submerging them in water or exposing them to prolonged moisture.


While baked polymer clay offers a certain level of water resistance, it is not entirely waterproof. The extent of its water resistance depends on factors such as the type of clay, baking conditions, surface finish, and intended use. If you require greater water resistance for your polymer clay projects, applying appropriate finishing techniques and sealants can help enhance its ability to withstand moisture. As with any crafting material, understanding its properties and taking appropriate measures will ensure the best results in your creative endeavors.

Rate article
Add a comment