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Gelcoat: What It Is, How It’s Used, and How to Repair It Gelcoat is the outermost protective and cosmetic layer used on fiberglass parts. Understanding how gelcoat works — and how to apply or repair it correctly — is critical to achieving long-lasting performance and professional results. What Is Gelcoat? Gelcoat is a pigmented polyester or vinyl ester resin applied to the surface of fiberglass parts. It creates a smooth, high-gloss finish while protecting the underlying laminate from wat...

Open Molding & Lamination Technical Support Open molding and hand lay-up remain some of the most widely used fiberglass manufacturing methods in marine, industrial, and composite fabrication. Successful lamination depends on selecting the correct laminating resin and understanding how resin formulation, processing behavior, and cure characteristics affect the finished composite part. What Are Laminating Resins? Laminating resins are polyes...