General Purpose Polyester Resin is most commonly used in marine and composite industry. The Polyester Resin is styrene-based, flammable and catalyzed when combined with Methyl Ethyl Ketone Peroxide [MEKP]. The Polyester Resin can be used with any type of fibreglass, carbon fibre as well as used over urethane foam and other sandwich core materials. General Purpose Polyester Resin tends to be fairly rigid when cured and also more brittle than epoxy resins.