What is Air Dry Clay and Can It Be Waterproof?

Air Dry Clay, also known as air-hardening clay, is a type of modeling clay that hardens when exposed to air, eliminating the need for baking or firing in a kiln. This clay is typically made from natural materials like clay fillers and binders, making it easy to work with for various crafting and sculpting projects. Once dried, it can be painted, decorated, and used for various applications such as pottery crafts and decorations.

Understanding the Nature of Air Dry Clay

Unlike traditional clays that are oil-based and cannot technically dry, air dry clays are water-based. This means that despite their solid appearance once dried, they can still be affected by moisture. Air dry clays must be sealed after drying, and if not, they won't be fully waterproof. Proper sealing is essential to protect the clay from moisture and maintain its integrity over time.

The Waterproofing Challenge of Air Dry Clay

Once air dry clay has dried, it is generally not waterproof. To enhance its water resistance, several steps can be taken:

Sealants to the Rescue

A key method to make air dry clay more resistant to moisture is by applying a waterproof sealant or varnish after the clay has dried. Various sealants are available in the market, specifically designed for use on clay. These products can create a protective layer that prevents water from penetrating the clay's surface.

Brand Selection

Different brands of air dry clay have varying levels of water resistance. Some are specifically formulated to be more water-resistant than others. Researching and choosing a brand known for its durability can help enhance the clay's performance in harsh environmental conditions.

Avoiding Water Exposure

While sealants can protect the clay from moisture, it's best to avoid prolonged exposure to water. For indoor decorations or items used in dry environments, air dry clay can be more suitable. Proper storage and application techniques are essential to maintain the clay's integrity.

Sealing Your Air Dry Clay Projects

Many air dry clays require sealing to achieve full water resistance. Here are the most common sealants used for air dry clays:

Permanent paints, such as acrylic paints Clear finishes like polyurethane or permanent clear finishes Permanent white glues Acrylic mediums sealers Clear epoxy resin or epoxy glue

It's crucial to seal air dry clays, especially if they were made with flours or other foods, as critters might attempt to gnaw on them. Proper sealing not only protects the clay but also enhances its longevity and appearance.

Comparing Air Dry Clay to Other Types of Clay

Earthen clays, which are water-based, can be made hard by firing in a kiln. However, to be fully waterproof, they need to be coated with ground glass glazes and fired again. On the other hand, other main types of clay—such as oil-based polymer clay and epoxy clay—are already waterproof and don't require sealing.

In summary, while air dry clay itself is not inherently waterproof, proper sealing techniques can significantly enhance its water resistance and protect your creations from moisture damage.