Yes, air dry clay can get wet.
Air dry clay, even after it has hardened, remains porous. This means it has tiny holes that can absorb moisture, much like a sponge. When exposed to water, the clay will soften and can potentially lose its shape, crack, or even crumble. This is because the water rehydrates the clay particles, undoing the hardening process.
Here's a more detailed explanation:
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Porosity: The key factor is the porous nature of air dry clay. Unlike kiln-fired clay, air dry clay doesn't undergo the high-temperature vitrification process that makes it waterproof.
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Effect of Water: When water comes into contact with dry air dry clay, it's absorbed into these pores. This weakens the clay structure and can lead to several issues:
- Softening: The clay becomes pliable again.
- Shape Distortion: The piece can slump or deform under its own weight.
- Cracking: Uneven absorption of water can cause stress and lead to cracks.
- Crumbling: In severe cases, the clay can completely disintegrate.
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Protecting Air Dry Clay Projects: To protect air dry clay projects from moisture damage, you can:
- Apply a sealant: Several coats of varnish, acrylic sealer, or polyurethane can create a barrier against water.
- Avoid water exposure: Keep the finished piece away from humid environments and direct contact with water.
- Consider alternative materials: If your project requires water resistance, consider using polymer clay or kiln-fired clay instead.
