Smooth-On - Plasti-Paste Support Shell

Plasti-Paste Support Shell

Build rigid mother molds that won't sag on vertical surfaces

Rubber molds need support structures that won't slump mid-application or add unnecessary weight to your workspace. Plasti-Paste stays exactly where you spread it on vertical surfaces, building up reinforcing shells without the frustration of gravity-induced sagging. Fiber-filled formulation cures to a rigid yet lightweight plastic that provides genuine structural support for flexible molds without the heft of traditional mother mold materials.

This paste functions equally well as an industrial-strength adhesive for equipment repair and fabrication bonding. Once cured, the resulting surface accepts standard workshop finishing: you can sand it smooth, drill mounting holes, or machine it to precise tolerances. Add pigments to match existing structures or create visual coding for different mold sections. The combination of workability and final strength makes this material valuable beyond mold-making, sculptors use it for armature reinforcement, prop makers rely on it for structural repairs, and fabricators keep it on hand for bonding dissimilar materials.

Apply with palette knives or spatulas to build up thickness gradually. The paste won't run or drip during application, letting you focus on creating even coverage rather than fighting the material's tendency to migrate.

Sculpting

Sculpting Purchase Guide

Sculpting Materials and Tools

Straight Chisels - Essential wood carving tools for creating detailed sculptures and decorative woodwork. Available in various sizes and shapes for different carving techniques.

Modeling Clays - Various types of sculpting clay including polymer clay, air-dry clay, and oil-based modeling clay for different sculpting applications.

Modeling Tools - Professional sculpting tools including wire tools, loop tools, and specialty implements for shaping and detailing clay and other sculpting materials.

Mold Making - Materials and tools for creating molds including silicone rubber, plaster, and casting materials for reproducing sculptures and decorative elements.

Modeling Frames and Wires - Armatures and support structures for creating stable foundations for sculptures and ensuring proper proportions.

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