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!

  • 2 oz Fiberglass Fabric

    Cures as Transparent, Protective Surface Layer
    5 star rating
    Particularly lightweight and thin, our #241 2-ounce Plain Weave Fiberglass is ideally suited as a surface...
  • 4 oz Fiberglass Fabric

    Conformable and Lightweight Fabric for General Use
    5 star rating
    This 4-ounce Plain Weave Fiberglass Fabric is our most popular selection for use as a surface fabric, with...
  • 10 oz Fiberglass Fabric - Style 7500

    Industry Standard for Parts and projects
    5 star rating
    The 10-ounce Plain Weave—also known as Style 7500—is the most frequently chosen boat cloth. It is...
  • 20 oz Tooling Fabric

    Build Bulk, Strength and Stability for Molds
    When you're looking to build thickness into a mold with limited time, this #254 tooling fabric is the right...
  • Woven Roving

    Rapid Build and High Strength for Flat Areas
    5 star rating
    Woven Roving provides an inexpensive means to laminate large, flat areas that call for rapid build-up and high...
  • Chopped Strand Mat: 1 1/2 ounce

    Build Quick Thickness for Parts
    5 star rating
    1.5 oz/sq ft, 38" & 50" Wide, 0.045" Thick Chopped Strand Mat is most frequently used with polyester resin to...
  • Polyester Molding Resin

    General Purpose Resin for Part/Mold Fabrication
    4.8 star rating
    #77 Molding Resin is ideal as a orthophthalic fiberglass resin for general purpose part fabrication and for building...
  • Isophthalic Polyester Resin

    Build Strength and Stability for Tough Parts
    4.9 star rating
    #90 Isopthalic Polyester is perfect for fabricating dimensionally stable polyester molds and corrosive service...
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