When a composite part needs to be reproduced numerous times, it is efficient to build a mold from which the part can be reproduced. Properly molded composite parts emerge perfectly shaped every time and require little post-finishing work. Molds are commonly made of polyester resin with a variety of reinforcements. For a quick, simple mold for one-time use, casting urethanes are an inexpensive and reliable option.

Male and female molds are the two fundamental types of forms, but they yield significantly different parts. Male (or positive) molds are generally less time consuming and less costly to create in comparison to female (or cavity) molds. However female molds offer numerous advantages for medium to large production runs.

For an in-depth description of the steps necessary to create accurate, high-quality, low-distortion molds for producing composite parts, please read the Mold Construction article in our Learning Center. Shop our favorite selection of fiberglass reinforcements, casting urethanes, epoxy and polyester resins, and tooling gel coats!

  • Fast Set Tooling / Prototyping Urethane Kit

    Put Parts into Service within a Day!
    #4113 Fast Set Tooling / Prototyping Urethane Kit is a two-part urethane casting system for molds or parts. This...
  • Black Tooling Gel Coat

    Build Lasting Durability for Molds
    5 star rating
    Tooling Gel Coat is an abrasion resistant gel coat for making molds where gloss retention, superior hardness,...
  • Orange Tooling Gel Coat

    High Gloss and Superior Hardness for Molds
    4.9 star rating
    Tooling Gel Coat is an abrasion resistant gel coat used for fabricating molds when gloss retention, superior...
  • Gel Coat Thickness Gauge

    Simple, Precise Measure for Gel Coat Thickness
    5 star rating
    Our gel coat thickness gauge is the perfect tool for measuring wet mil thickness as you apply your gel coat. It...
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  • Duratec® Gray Surfacing Primer

    Easy-Sand, Best Choice Primer for Plugs and Molds
    4.5 star rating
    Duratec® Gray Surfacing Primer is the best choice for coating your plug or reconditioning your mold. It is...
  • Parting Wax

    Simple and Reliable Mold Release Wax
    5 star rating
    Parting wax is a non-silicone green wax specially formulated to produce a tough, durable, high-gloss surface. When...
  • PVA Release Film

    Easy Spray-On – Easy Release for Molds
    5 star rating
    PVA, or polyvinyl alcohol, should be used with our #1016 Partall Wax for the easy release of parts from a mold. Wax...
  • Acetone

    Industry Standard for Dissolving Resin
    5 star rating
    Acetone is a powerful solvent, used in the composite industry as the standard for cleaning and degreasing. It will...
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