The first step in the fiberglass mold building process is to create a plug. A plug is the form which is to be duplicated and is usually a representation of the finished part. This can be an actual part, a reproduction, or a completely new form. In planning for the mold, certain factors must be taken into consideration; surface finish, draft angles, undercuts, and method of production. A quality mold surface begins at the plug stage. Every imperfection on the plug surface will be transferred to the mold, and to all subsequent parts. The preferable surface finish for the plug would be a Class "A" finish, which means it would be a polished, high-luster finish, free from any porosity or scratches.

Fibre Glast offers everything you will need to create a durable, high-gloss, Class 'A' finished plug, from polyisocyanurate foam, modeling clay, reinforcement and fairing compound to surfacing primer and mold release products.

Photo Credit: John Gregg, Gregg Drilling & Testing Inc, Signal Hill, CA.

  • PVA Release Film

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

    Extremely Smooth with Excellent Adhesion
    5 star rating
    This oil-based modeling clay is non-drying and can be carved and shaped easily without cracking. It features...
  • Chavant Le Beau Touché Clay HM

    Smooth and Adhesive for High Working Temps
    4 star rating
    This oil-based modeling clay is non-drying and can be carved and shaped easily without cracking. It features...
  • Chavant Y2-Klay Industrial Design Clay

    Create Accurate Prototypes and Patterns
    4 star rating
    This dark brown, hard styling clay is workable at 135°F and is hard at, or below, room temperature. TY2 Klay...
  • Chavant AutoStyle Industrial Design Clay

    Smooth Medium-weight for Prototypes
    5 star rating
    Professionals want the workability of a sulfur-based clay…without the risk of compromising their metal...
  • Chavant Monu-Melt Hard Design Clay

    Meltable Clay that can be Brushed onto Foam
    This dark, forest green colored, sulfur-free modeling clay offers a new option when creating plugs for new...
  • Glyptic Set Standard Clay Tools

    Professional Quality Clay Modeling Tools
    The Glyptic modeling tools are made for professional modeling and are made from high quality materials to last a...
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  • Featherweight Scissors

    Lightweight, Durable, and Extremely Sharp
    5 star rating
    Gingher ® Featherweights are versatile enough to tackle most jobs in the workshop. These lig... 
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You can place an order right here on our website or, if you have any questions, call 1.800.838.8984 | 8 a.m. - 5 p.m. EST Mon-Fri.

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