Methyl ethyl ketone peroxide (MEKP) is a reliable catalyst used to initiate the curing process of polyester resins and fiberglass composites. Designed for professional applications, it ensures efficient and consistent hardening, resulting in strong, durable finishes. Ideal for boat building, repairs, and other composite fabrication tasks, this hardener offers precise control over curing times to meet your project’s specific requirements. ** Gallon size shown below cannot ship by UPS. We can only send with orders shipped by pallet with a common carrier. **