This rigid polyurethane foam from Etsy is dust-free and easy to paint. It provides crisp edges, making it a professional replacement for wood in signage or prototyping. FloraCraft Styrofoam Sculpting Block United Art and Education Go to product viewer dialog for this item.
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A soft polyurethane option for upholstery-based art or fabric-covered pieces. Find it at Walmart for $10.97. This rigid polyurethane foam from Etsy is dust-free