ELAN-Plus™ MEKP-9 Red Catalyst is a liquid ketone peroxide free-radical polymerization initiator. Catalyst for two-component, unfilled, very flexible polyester resin system. Suitable for room temperature cure applications when used with organometallic or tertiary amine promoters. - Products are filled and sold by weight and may contain less than the nominal volume of the container. Red color indicates when mixing is complete (color will dissipate with cure).