The present invention relates to an aqueous epoxy resin blend dispersion of a high mw epoxy resin and a liquid epoxy resin with a dispersant having an interfacial tension such that a drop of the mixture of the dispersant in a melt of the epoxy resin blend against water is less than 2 dynescm, preferably less than 1 dynecm, and a process for preparing this epoxy resin blend dispersion. A first unordered list of merchant sources is received from a queried search engine. Microwave energy, which may be generated by a gyrotron, may then be directed toward the mold, to heat the polymeric material without heating the mold.