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.

2 Quart
2 Gallon
10 Gallon


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

Customer Questions & Answers

  1. Q I need to replicate round feet on a cabinet. Several have rotted out and off. I was going to use the liquid wood and then the mold with wood epox to build up the feet. Will mastermold work for this?
    Answered by the admin

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

  2. Q Looking for a cost effective solution to replicating several terra cotta corinthian capitals that cap composite windows on a c. 1900 residence.
    Answered by the admin

    Please send your photos and details of dimenstions to

  3. Q Looking for supplier in Canada.Thanks
    Answered by the admin

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

  4. Q What size kit do I need for making a mold for crown moulding that is 5" wide 2" deep and 8' long
    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.
  5. Q I'm a painting contractor in Michigan's upper pennisula. I have a tin ceiling that has been damaged by water, some rusted panels. My customer would like to replicate them. Would you please provide me with the appropriate products. I can send you photos, the panel size is approximately 2x2. Thanks Jonathan
    A Either MasterMold 12-3 or MasterMold 12-8 will be a good choice for your project. We recommend casting the panels with WoodCast light-weight epoxy casting compound.

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