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...
Max Cor CF Epoxy Primer (Controlled Fusion Technology) How and Why to Use Max Cor CF Max Cor CF Epoxy Primer is a high-performance, chromate-free corrosion primer engineered for aluminum and steel in marine and industrial environments. Designed with Controlled Fusion Technology, it chemically bonds to properly prepared metal surfaces to create a durable, corrosion-resistant foundation for subsequent coatings. This system is ideal for aluminum boats, towers, structural components, a...
Hullgard Extra Epoxy Primer Application Guide How and Why to Use Hullgard Extra Hullgard Extra Epoxy Primer is a high-build, anticorrosive substrate primer designed to create a stable foundation for fairing compounds and finishing systems. It is commonly used after corrosion primers like Max Cor CF to build film thickness, improve adhesion, and prepare surfaces for Awlfair and topcoat systems. This primer is ideal for aluminum, steel, and fiberglass substrates where long-term durab...
Mirka Marine Surface Finishing Systems From heavy sanding to high-gloss finishing — complete systems for fiberglass, gelcoat, and marine coatings. About Mirka Mirka Ltd is a global leader in abrasives technology, delivering complete sanding and polishing systems designed to improve surface quality, efficiency, and profitability. ISO 9001 – Quality Assurance ISO 14001 – Environmental Management OHSAS 18001 – Occupational Safety Perfect Surfac...
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...
Polyester vs Vinyl Ester Resin: Understanding the Differences Choosing the correct resin is one of the most important decisions in fiberglass lamination. Polyester and vinyl ester resins are both widely used in open molding, hand lay-up, and spray-up applications, but they offer different performance, durability, and cost characteristics. Understanding how these resin systems differ will help you select the right material for your project, environment, and performance requirements. ...
Preparing Previously Painted Surfaces for Awlgrip Many boat refinishing projects involve applying new coatings over previously painted surfaces. Proper inspection, cleaning, and sanding of existing paint systems is critical to ensure long-term adhesion and professional finish quality. The condition of the existing coating determines whether it can be recoated directly or if removal and full surface preparation are required. Evaluate the Existing Paint System Before beginning...
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