Nitrile Gloves: Surgical-grade, latex-free synthetic rubber gloves used to prevent oils and dirt from the hands contaminating glass surfaces. Nitrile gloves protect hands from harmful primer, prep and adhesive chemicals. Perimeter: The outside edge of the windshield where the urethane is applied. Pinchweld: The one-inch ledge surrounding the opening of the vehicle that supports the windshield. On that pinchweld the urethane adhesive attaches to the glass. Primers: A chemical undercoat applied to the pinchweld to prepare the surface for optimum urethane adhesion. Resin: A clear liquid substance used to seal crack and breaks in a windshield, thus preventing them from spreading. Repair One: A system developed to repair breaks before they spread. With the exclusive Repair One process: