WATER EXTENDED THERMOSETTABLE RESIN COMPOSITIONS ARE PREPARED BY FORMING STABLE WATER-IN-RESIN EMULSIONS WITH VINYL ESTER RESINS, CERTAIN MODIFIED VINYL ESTER RESINS AND VINYL ESTER/UNSATURATED POLYESTER RESIN COMPOSITIONS. THE RESIN PHASE CONTAINS FROM 30 TO 60 PERCENT BY WEIGHT OF AN ESSENTIALLY WATER INSOLUBLE MONOMER COPOLYMERIZABLE WITH SAID RESINS. THE EMULSIONS ARE PREPARED TO CONTAIN FROM 30 TO 70 PERCENT BY WEIGHT WATER. THE NOVEL WATERIN-RESIN EMULSIONS ARE PREPARED WITHOUT THE NEED FOR AN EMULSIFYING AGENT. THE VINYL ESTER RESINS EMPLOYED ARE COMPOUNDS CONTAINING A PLURALITY OF TERMINAL UNSATURATED ACID ESTER GROUPS OBTAINED BY REACTION OF COMPOUNDS HAVING A PLURALITY OF OXIRANE GROUPS WITH ALPHA, BETA-UNSATURATED CARBOXYLIC ACIDS.