For circular chips, position the applicator on the glass with the suction ring so the central hole is over the crack; screw the sleeve with the screw so the end s the center of the crack, remove the screw and add the appropriate amount of adhesive into the applicator. Operate the piston several times to push adhesive into corners. Remove the applicator, apply protective foil and press to avoid adhesive leakage, ensure no air bubbles under the foil. After a few minutes, break the foil and remove excess adhesive with the attached razor blade. For linear cracks, apply adhesive along the crack without the applicator and cover with protective foil along the full length; let the adhesive dry and then remove the foil and excess adhesive. Best effectiveness at room temperature and on sunny days. Effectiveness may be limited for cracks longer than about 15 cm, cracks that extend along the glass edge in two places, or cracks located on the interior glass surface. Car Maintenance Set