Our Fiberglass Fabric Slitting Rewinding Machine is able to process all types of Fiberglass Cloth Fabric of any thickness. A cloth fabric made of fine fiberglass strands woven at right angles to each other, fiberglass cloth is the most common composite material used in boat building, repairs, and reinforcing of wood. Fiberglass cloth is used with epoxy and this cloth is stronger than fiberglass matting. It is most often used in layered buildups.