Apparatus for applying plural components to a work surface. One embodiment contemplates the application of a primarily resinous solution having an operative amount of catalyst admixed therewith. Another embodiment contemplates the application of an epoxy comprising substantially equal parts of resin and catalyst. The apparatus segregates the operating fluid from the components being pumped so that an epoxy may follow or be preceded by an application of polyester resin, in the absence of apparatus cleaning or flushing between applications.