A method of manufacturing a fiber-reinforced article. The method includes the steps of providing a mat fiber structure defining voids therein. A membrane structure is applied over at least a portion of the fiber structure. The membrane structure includes a microporous membrane. At least the microporous membrane of the membrane structure has an oil resistance rating of at least a number 8 determined by AATCC 118 testing. A resin and hardener mix is provided. The resin is infused into voids of the fiber structure by applying a vacuum to the fiber structure and the membrane structure wherein the membrane structure inhibits the flow of resin therethrough.