To effectively seal air dry clay for use with plants, the best method is to apply a polyurethane or acrylic sealer. These types of sealants are recommended because they create a durable, water-resistant finish that protects the clay and helps prevent yellowing over time.
When using air dry clay for plant pots, saucers, or decorative items that will be near moisture, proper sealing is crucial. Air dry clay is porous and will absorb water, which can weaken the structure and cause it to disintegrate or mold. Sealing creates a barrier against moisture.
Why Seal Air Dry Clay for Plant Use?
- Water Resistance: Air dry clay is not waterproof on its own. Water can damage it.
- Durability: Sealing adds a protective layer, making the finished object more robust.
- Longevity: Prevents the clay from breaking down or molding due to moisture exposure from watering plants.
- Aesthetics: Protects any paint or decoration and prevents the clay itself from degrading or yellowing.
Recommended Sealants
Based on recommendations, polyurethane and acrylic sealers are top choices for air dry clay projects intended for plant environments.
| Sealant Type | Benefits | Application Tips |
|---|---|---|
| Polyurethane | Excellent durability, highly water-resistant | Available in brush-on or spray forms. Apply multiple thin coats. Allow drying time between coats. |
| Acrylic Sealer | Water-resistant, prevents yellowing, versatile | Available in brush-on, spray, or liquid dip forms. Often water-based for easy cleanup. Apply evenly. |
These types of sealants provide a durable, water-resistant finish to protect the air dry clay and prevent it from yellowing, making them ideal for objects near plants.
Sealing Process Steps
Follow these steps to effectively seal your air dry clay plant items:
- Ensure Clay is Fully Dry: Your air dry clay piece must be completely dry before sealing. This can take 24-72 hours or longer depending on thickness and humidity. Sealing damp clay can trap moisture and lead to mold.
- Clean the Surface: Gently wipe away any dust or debris from the surface of the clay.
- Apply the First Coat: Apply a thin, even coat of your chosen polyurethane or acrylic sealer. Follow the manufacturer's instructions regarding application method (brush, spray) and recommended thickness.
- Allow to Dry: Let the first coat dry completely according to the product's drying time.
- Apply Additional Coats: Apply two or more additional thin coats, allowing each coat to dry fully in between. Multiple thin layers are generally more effective than one thick layer for creating a strong, uniform barrier.
- Cure Time: Allow the final coat to cure fully. Curing time is different from drying time and can take longer, sometimes several days or even weeks, to achieve maximum hardness and water resistance. Check the product label for specific curing instructions.
- Seal All Surfaces: For best results, seal the inside, outside, and bottom of the clay object to create a complete barrier against moisture penetration from any angle.
Practical Tips
- Test First: If you are unsure about a sealer, test it on a small, inconspicuous area or a scrap piece of the same clay.
- Ventilation: Work in a well-ventilated area, especially when using spray sealers or solvent-based products.
- Read Labels: Always read and follow the specific instructions and safety warnings on your sealant product.
- Not for Submersion: While sealing makes the clay water-resistant, air dry clay items sealed this way are generally not suitable for being fully submerged in water for extended periods, like acting as a primary pot without drainage or a liner. They are best for decorative covers, saucers, or pots with drainage holes used with a liner.
By using recommended sealants like polyurethane or acrylics and following the proper application process, you can create durable, water-resistant air dry clay items suitable for enhancing your plant displays.
