Numerous studies have been conducted to elucidate the mechanism(s) by which glass-reinforced polyesters (GRPs) degrade in aqueous solutions varying in salt concentration, pH and temperature. In this work, we examine the degradation kinetics of two GRPs in two organic solvents, 1,1,1-trichloroethane (TCE) and toluene, to ascertain if these laminates could be utilized in fuel or solvent storage and transportation applications. The tensile strength of isophthalic and vinyl ester laminates is not significantly affected ( > 85% retention) by TCE after 270 days of immersion. While incorporation of a polyethylene terephthalate (PET) or C-glass surface veil does not improve tensile strength retention and, in fact, reduces the flexural strength of the vinyl ester GRPs, these veils preserve surface finish by reducing blistering. In toluene, the GRPs behave quite differently. A marked increase in toluene absorption into the vinyl ester laminate is accompanied by a substantial reduction in tensile strength retention (with or without a surface veil). From these results, a two-stage degradation mechanism for vinyl ester in toluene is proposed in which the first stage corresponds to diffusion-limited plasticization and the second reflects matrix relaxation/swelling.