Whether you are using a male or female mold, creating a Class 'A' finish on the mold surface is critical. Just as boats and other fiberglass structures can deteriorate over time, a porous mold surface permits water, chemicals, or other harmful agents to enter the structural laminate below. The condition of the mold surface affects three important areas of the molding process:

  • The quality of the mold's cosmetic finish will be reproduced in every part.
  • The mold surface affects the release characteristics of the mold.
  • The mold surface coat is the protective barrier to the rest of the mold.

For an in-depth description of the techniques necessary to achieve a Class 'A' mold surface finish as well as the steps required to maintain it, see the Plug Surface Preparation & Mold Surface Maintenance article in our Learning Center. Shop our complete selection of mold preparation products below!

  • Styrene Wax

    Get a Complete Cure for Polyester Resins
    4.5 star rating
    Add Styrene Wax to non-waxed polyester resin and gel coat to prevent the prolonged tackiness associated with thin...
  • 3M™ Wetordry™ Sandpaper

    Achieve Near-Perfect Surface Quality
    Time spent sanding plugs, molds, and finished parts will dramatically improve their longevity and quality. So, it's...
  • Sanding Sponges

    Smooth Out Tooling Marks
    These popular abrasive pads are coated on two sides with silicon carbide and are extremely flexible. Use them to...
  • Hard Rubber Sanding Block

    Ideal for Heavy Hand-Sanding
    Avoid leaving finger pressure marks and make the job of hand sanding a little easier. Use with any grade sandpaper...
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  • 3M™ Wetordry™ Sponge Pad

    For Light-Pressure Finish Sanding
    3M ™ WETORDRY ™ Sponge Pads are ideal for eliminating fine scratches and finger waves... 
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  • Mold Release Clip System

    Quick, Sturdy Fastening System for Molds
    5 star rating
    Make the finishing stages of mold-making go much smoother. This unique clipping system is designed to quickly joins...
  • Release Wedges

    Safe, Reliable Tools for Mold Release
    5 star rating
    Fabricators use plastic release wedges to help remove medium-to-large parts from a mold. Wedges are inserted around...
  • Air Injected Wedge

    Use Air to Carefully Separate Stubborn Parts
    Experienced fabricators will likely run across that hard-to-separate part, whether it's larger in nature or just...
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