2mm Coremat® is a lightweight, microsphere-filled polyester bulking mat used in fiberglass and composite laminates to add thickness, stiffness, and print-control. At just 2mm thick, it’s perfect for marine, automotive, and industrial applications where weight savings and surface quality are critical. This fabric wets out easily, conforms to curves, and is compatible with polyester, vinyl ester, and epoxy resins. Sold by the yard (50″ wide).