Mastermold 12-3®

Makes Molds of Any Size for Architectural and Artistic Reproductions. 

Uses: Build up this flexible polyurethane mold-making paste in one application to replicate intricately detailed architectural elements. Use on both vertical and overhead surfaces. Designed for making molds of elements that cannot be removed from the structure, as well as molds with severe undercuts, including: busts, statues, finials, reliefs, and furniture parts where a one part mold is desirable. Other typical used include reproducing capitals, ceiling medallions, corbels, moldings, figurines, and other three dimensional objects. Molds are reusable.

Features and Benefits: MasterMold 12-3 is easily spread on the model to produce a smooth, bubble-free mold surface that captures the finest details. The molds are ready to use in less than one day. Its elasticity, softness, and high strength permit easy peeling from intricate shapes. Support molds for supporting the flexible mold while casting, can be made with plaster, WoodEpox, or resin/fiberglass techniques. Release agent is necessary for both the model and when casting the mold in most instances. Release agent is not necessary for water-based casting materials.

Technical Characteristics:  Hardens in 8-12 hours at room temperature. Easy proportioning of 1 part resin to 1 part hardener by volume. Use within 4 months of receipt.

2 Quart
2 Gallon
10 Gallon


Typical Test Results
Elongation >600%      
Hardness, Shore A 38      
Tensile Strength   12.7   180

Questions and answers of the customers

  1. A

    Please call our technical department at 800-445-1754 for assistance.

  2. A

    You can make a mold of the item you wish to replicate with the MasterMold.

  3. A

    Please call our technical department at 800-445-1754.


    Please call our technical department at 800-445-1754.


    Please send your photos and details of dimenstions to

  4. A

    The Mastermold 12-3 is not available at any of our dealers. You can order it directly from us. We ship orders via UPS.

  5. A You will need at least one 2 gallon kit. If you would like help calculating the volume needed please call customer service at 800/445-1754.

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