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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. ...

Boat Restoration Technical Support Guide Last updated: February 2026 Boat restoration is the process of repairing, rebuilding, and refinishing fiberglass boats to restore structural integrity, appearance, and long-term performance. This technical support guide serves as a master reference for understanding materials, repair methods, and best practices used in modern fiberglass boat restoration. This page is designed as a living knowledge base. Each section below will continue ...

MEKP Catalyst Calculator & Mixing Guide (oz, mL, cc) MEKP Catalyst (Methyl Ethyl Ketone Peroxide) is used to cure polyester resin, vinyl ester resin, and gelcoat. The correct mix ratio is critical to ensure proper curing, strength, and finish quality. Standard mix: 1.5% MEKP (about 2 oz per gallon of resin). Important Mixing Notes This information is based on MEKP 925 and tested at 77°F (25°C) . These are estimates and may vary depending on the resin system, shop conditions, and ap...