ORCA Economy Resin is a non spec resin and may change by batch, thixotropic, non-waxed, polyester resin designed for general use at an ambient temperature. It is pre-promoted for curing at room temperature with the addition of methyl ethyl ketone peroxide (MEKP) initiator. If higher bonding properties are required use P-16, P-17 or 555. 2 month shelf life from shipment date.