You can safely use a cold knife on the exterior to cut the urethane adhesive only if the windshield has been broken. If you want to save the glass, cut the urethane with a reciprocating or oscillating power knife from the interior. You should take out the inside rear view mirror, windshield
Wiper Arms and cowl cover. After that, it's important to cover the areas of the instrument panel and hood. After that, take away the windshield A-pillar moldings by using an appropriate hook and trim stick and use a sharp cold knife or power cutter to detach the windshield from the A-pillars, roof header and cowl pinch weld fences. With the interior approach, once the windshield is removed, take out the rear view mirror, top of the instrument panel and A-pillar trim parts, then drape shields on the instrument panel and hood and cut the urethane adhesive with a reciprocating or oscillating power knife. To avoid putting pressure inside the cab, first take out the front left door glass and then place the windshield, after which ensure the glue takes 24 hours to dry before you use the car again. The urethane bonding applied to the windshield fence should follow the shape of the windshield and match its surface and the supports or spacers should be cleaned and fitted on weld studs or repair screws below the windshield opening. Place the replacement windshield in the center of the area, using support spacers, confirm it is level against the pinch weld fence and refashion the fence if it is needed to fit the new glass correctly. Clean inside your windshield with an ammonia-based cleaner and a lint-free cloth, add molding on the top of the windshield and apply Glass Prep and Glass Primer around the edge for drying. Take off most of the original urethane, making sure not to touch the paint on the windshield fence, add a layer of pinch weld primer and end with a bead of urethane directly down the center line of the windshield fence. Use help to place the windshield on the opening, matching the marks with the spacers and slowly guide it down until the molding fits with the top of the roof and the pillars. After you finish coating urethane, remove it from the vehicle, tape the moldings into place with masking tape and then set the A-pillar moldings, cowl cover, wipers and inside rear view mirror in place. Once the urethane has hardened, take off the tape and test the repair by water. Fein Power Cutout Knife and Equalizer Magnum, Interior Auto Glass Cut Out Knife and only urethane adhesives from Oem-certified suppliers are suitable for these repair jobs according to Fmvss 212 and Fmvss 216 standards.