Sold in 2lb blocks.

NSP is a professional-grade, sulfur-free sculpting clay trusted worldwide by artists, sculptors, and special effects professionals. Designed to capture fine surface detail with precision, NSP has a slightly waxier and tougher feel than traditional plasteline clays—making it ideal for detailed sculpting, mold preparation, and pattern work.

Because NSP contains no sulfur, it eliminates inhibition issues when used with liquid rubber mold-making materials. Its unique formulation allows for clean, sharp cut lines with smooth edges, while maintaining flexibility and strong adhesion during extended working sessions. The surface has a naturally “grabby” texture that many artists prefer for controlled shaping and fine detail.

NSP can be heated and melted at approximately 185°F, allowing it to be poured, brushed, or sprayed for added versatility. It is commonly used for sculpture, filling cracks in industrial patterns, and building dams for splash molds. Product designers and fine artists alike rely on NSP for both creative and technical applications.

Available in Soft, Medium, and Hard to suit different techniques and preferences.

Product Details

Sulfur-free formulation
Meltable and pourable at approximately 185°F
Available in Soft, Medium, and Hard

Material Characteristics

NSP clays contain a higher percentage of wax components, giving them a tougher feel and excellent durability. Even the Soft grade may feel firm to some users, offering greater control and clean detailing.

NSP is subject to natural surface oxidation over time, especially with repeated heating and cooling. When stored in its original packaging, it has a long shelf life—often lasting months or years. In some applications, surface oxidation can be beneficial, creating a slightly firmer working surface for sculpting or mold making.

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