this invention relates to foundry binder systems , which cure in the presence of sulfur dioxide and an oxidizing agent , comprising an epoxy resin ; an alkyl silicate ; an ester of a fatty acid , an effective amount of a oxidizing agent , and no ethylenically unsaturated monomer or polymer . the foundry binder systems are used for making foundry mixes . the foundry mixes are used to make foundry shapes which are used to make metal castings , particularly ferrous castings .