Versatex. In partnership with FastenMaster, the maker’s Cortex Concealed Fastening System uses a proprietary trim screw and a combination setting tool/drive to countersink the fastener into the PVC trim. The hole is then filled with a Cortex PVC plug. The Cortex system eliminates caulking, sanding, and painting to hide fastener holes. The plugs are made from the same material as the trim, can mimic smooth or wood-grain surfaces, are fully paintable, and are warranted for the life of the trim. 724.857.1171.