To make Crayola air dry clay water-resistant, you need to seal it once it's completely dry, typically using an acrylic varnish.
Crayola Air-Dry Clay is a wonderful medium for creative projects, but like most air dry clays, it is porous and susceptible to moisture once dried. To give your finished pieces greater durability and resistance to water, sealing is essential.
According to the manufacturer, Crayola® Air-Dry Clay can be sealed once your piece is completely dry after 72 hours. Once dry, they suggest using an acrylic varnish. Applying a sealant like acrylic varnish creates a protective layer on the surface of the clay, reducing its porosity and preventing water from easily penetrating it.
The Sealing Process
Achieving water resistance involves ensuring the clay is fully cured and then applying a suitable sealant.
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Ensure Complete Drying:
- Allow your clay creation to dry thoroughly. As stated by Crayola, this process requires at least 72 hours to ensure the clay is completely dry before sealing. Drying time can vary based on humidity, temperature, and the thickness of your piece. It should feel hard and no longer cool to the touch.
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Choose a Sealant:
- The recommended sealant is an acrylic varnish. These varnishes are available in various finishes (matte, satin, gloss) and provide a durable, protective coat.
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Test Compatibility:
- Before applying varnish to your finished piece, make sure to test its compatibility with the varnish by applying it to a small, inconspicuous area or a test scrap of dried clay. This helps ensure the varnish doesn't negatively affect the clay or its colors.
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Apply the Varnish:
- Using a brush, apply the acrylic varnish evenly over the entire surface of your clay piece.
- Allow the first coat to dry completely according to the varnish manufacturer's instructions.
- For better water resistance, you may apply multiple thin coats, allowing each coat to dry fully in between applications.
Important Considerations
- Not Submersible: While sealing with acrylic varnish significantly increases water resistance, it typically does not make the clay piece fully waterproof for prolonged submersion in water. It provides protection against splashes, humidity, and light moisture.
- Surface Preparation: Ensure the clay surface is clean and free of dust or debris before varnishing for the best adhesion.
- Ventilation: Work in a well-ventilated area when using varnishes.
By following these steps, particularly by allowing sufficient drying time and applying an acrylic varnish as suggested, you can make your Crayola Air-Dry Clay projects much more resistant to moisture.
