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Fiberglass Process

Fiberglass Process

Fiberglass lay-up is the most basic and one of the longest used reinforced plastic molding process. The mold design can be male or female configuration, and the mold surface is treated with a release agent that will facilitate removal of the finished part. A liquid gel coat of polyester, polyurethane, or other resin is applied to the mold surface. When the part is molded and removed, this gel coat will form the exterior surface of the part, a mirror image of the mold. Layers of reinforcement and resin are added to build the laminate to desired thickness. Lay-up is suited to making large structures requiring high strengths.

Fiberglass spray-up is a mechanized version of lay-up. A spray gun simultaneously sprays resin and chops continuous glass stands into specific length fibers. Chopped fibers enter the resin spray stream, and the polymer composition is generally used to back up a gel coat. The fiber-resin composition is rolled out to effect complete wetting of fibers and remove voids and bubbles before the resin cures.

Fiberglass Machine Description

Glas-Craft 2WP
Gel-Coat System

Magnum 3000 Chopper Gun

Magnum MRD-1000 Flo-Coater

Magnum HVLPF-5500-FIT

Fiberglass Process

Laminating Process
Drying Process

Tooling and Finishing

Turn around time can be greatly reduced due to our in-house mold making capabilities. Clay modeling is also available. Our Pattern and Mold Making Division specializes in FRP Tools, Epoxy Tools and Mass Cast.

Mass cast tools are usually made of plastic material; however, metal inserts are sometimes built into the unit for added strength at certain stress points. Either epoxy or polyurethane may be used. Mass casting of plastics is usually used where large tool surface is involved. The dimensional stability of a mass cast tool is lower than that of a laminated tool but is still well within the normal tolerances of strength forming operations.

FRP (Fiberglass)

  • Chip Brushes
  • Quick-Change Laminating Rollers
  • Radius and Corner Rollers
  • Adjustable Volume Dispensers
  • Diamond Cutting Tools & Blades
  • Bristle Rollers
  • Paddle Wheel Rollers

Epoxy molds or aluminum epoxy molds are reasonably fast in comparison to machined molds and are a relatively inexpensive way to create prototype and production tooling. New epoxy products offer a much higher compression strength and heat resistance. The molds can withstand injection and compression pressure with the use of aluminum standoffs or mold boxes.



Finishing Process