Vernonia oil, a naturally occurring epoxy functional triglyceride oil, was used as a solvent/reactive diluent in styrene-acrylate copolymerizations. The copolymerizations were initiated by free radicals and proceeded to high conversions in reasonable lengths of time. The copolymer solutions were light yellow-green in color and had moderate viscosities. Films were made by drawing the copolymer solutions over metal panels. The films were cured by adding a thermally labile cationic initiator known to catalyze oxirane-oxirane polymerization. The films obtained had good solvent resistances as evidenced by the number of methyl ethyl ketone double rubs required to mar and break-through the films. The cross-linking reaction was evaluated using mechanical property, DSC and extraction data.