You seal acrylic paint on polymer clay primarily with a varnish or acrylic sealer applied after baking the clay. This protects the paint from chipping, scratching, and general wear.
Sealing Acrylic Paint on Polymer Clay: A Step-by-Step Guide
Here's a detailed breakdown of how to properly seal acrylic paint on polymer clay:
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Bake the Polymer Clay First: Ensure your polymer clay piece is fully baked according to the manufacturer's instructions before painting and sealing. This provides a stable base for the paint and sealant.
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Apply Acrylic Paint: Once the clay is cooled, apply your acrylic paint as desired. Let the paint dry completely. Multiple thin coats are better than one thick coat.
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Choose the Right Sealer: Select a varnish or acrylic sealer specifically designed for polymer clay. Some sealers can react negatively with polymer clay, becoming sticky or causing discoloration. Brands like Varathane Polyurethane (water-based) and Sculpey Gloss Glaze are popular choices. Always test a small, inconspicuous area first.
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Apply the Sealer in Thin Coats: Use a soft-bristled brush to apply the sealer. Apply thin, even layers to avoid drips and pooling. Thick coats are more prone to bubbling and clouding.
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Allow Sufficient Drying Time: Let each coat of sealer dry completely before applying the next. Typically, 30 minutes between coats is sufficient, but always refer to the sealer's instructions. Apply multiple coats (2-3) for better protection.
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Optional: Sanding Between Coats: For an ultra-smooth finish, you can lightly sand between coats of sealer using very fine-grit sandpaper (e.g., 600-grit or higher). Clean off any sanding dust before applying the next coat.
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Curing Time: Allow the sealed piece to cure completely, according to the sealer's instructions. This may take several hours or even a day, depending on the product.
Considerations:
- Type of Finish: Sealers come in various finishes, such as gloss, matte, and satin. Choose the finish that best suits your project.
- Testing: Always test the sealer on a scrap piece of painted polymer clay before applying it to your finished project to ensure compatibility.
- Application Tools: Use high-quality brushes or applicators to avoid streaks or imperfections in the sealant.
- Ventilation: Apply sealers in a well-ventilated area to avoid inhaling harmful fumes.
- Brand Compatibility: Sticking to the same brand for paint and sealer can sometimes improve compatibility.
In summary, sealing acrylic paint on polymer clay after baking requires a suitable varnish or acrylic sealer applied in thin, even coats, with adequate drying time between coats, to protect the paint and create a durable finish.
