The invention relates to low VOC resin composition, comprising a polyester acrylic polymer having two or more polymerizable carbon - carbon double bonds in each molecule and at least one polymerizable vinyl monomer. Low VOC thermosetting polyester acrylic resins are made by esterification reaction of an unsaturated epoxide such as glycidyl methacrylate, and of a polyacid which is the half-ester formed by reacting a polycarboxylic acid and/or its anhydride with a polyol. The obtained low viscosity resin composition, is useful for making a low or zero VOC gel coat or a molded composite with excellent hydrolytic and weather resistance.