<p>The present invention relates to a resin composition comprising an unsaturated polyester resin comprising 1,3-propane diol building blocks and C5-C10 unsaturated dicarboxylic acid building blocks and further comprising a reactive diluent. Preferably, at least part of the 1,3-propane diol is derived from a non-fossil source. Preferably, itaconic acid or anhydride is used as the C5 unsaturated dicarboxylic acid.</p>
