Instructions for replacing a windshield

The windshield helps providing overall structural integrity on most modern vehicles. Correctly installed auto glass is essential for safety and reliability. Waterproof urethane adhesive bonds auto glass in the vehicle so they act together as a single unit to strengthen the auto body. The process of replacing a windshield is not difficult and can be done at home with the right tools and proper procedure.


  • Wear safety goggles and gloves at all times when working with glass.
  • Cover the dashboard and seats in the passenger compartment with protective sheeting in case of broken glass.
  • Remove the wiper with a wrench, and window moldings around the windshield with an electric screwdriver drill attachment. Also remove the hood with an electric screwdriver. The hood is a rubber seal acts as a barrier against water entering the vehicle behind the hood.
  • Cut any weather stripping with a windshield knife and pull it out of the cup.
  • Lubricate the edge of the windshield inside the vehicle and out, spray lubrication.
  • Cut the urethane cord around the glass. The cord is the original urethane adhesive used to install the windshield.
  • Insert the knife between the windshield and the glass body, and hold the knife so that it remains in a vertical position, while at the same time pulling you. Then go inside the vehicle and repeat, cutting the cord urethane windshield knife. If necessary, use a lever to loosen the windshield glass.
  • Lift the glass with suction cups.
  • Prepare the new windshield for installation by cleaning the edges with acetone to remove any dust or dirt remaining. Also clean the edge of the body panel where the glass comes into contact with the vehicle. This structure is called the flange.
  • Apply primer to the edge of the cup and around the flange. Then apply a new bead of urethane adhesive around the flange, a long, continuous strip of adhesive extending and bond with the glass and the car body. The amount of adhesive applied is equal to the depth of the flange, which seats against the vehicle glass.
  • Set the glass on urethane cord immediately. The urethane establish almost immediately.
  • Lower the windshield using a suction cup.
  • Check for leaks around the windshield with water from a garden hose.
  • Replace the seal around the outside edge of the windscreen if the vehicle had one.
  • Insert the tongue at the bottom of the separation in space between the glass and the vehicle, and removing the strip to expose the self-adhesive on the bottom of the extraction.
  • Reinstall the cover, wipers and moldings.
  • Remove the plastic sheet from the passenger cabin.
  • Clean the new windshield and the vehicle is ready to drive.

Tips & Warnings

  • Cut the heel age requires strength. Start in the center on top of the windshield and work to the left, until you reach the bottom. Then start again in the middle and working to the right and down toward the bottom. Continue to work with the knife against the old urethane but keep it upright for maximum cutting action. Always pull the knife toward you. Use spray lubricant to aid in the cutting through the dry adhesive.
  • Have two persons lift the auto glass and replace it so that there is less chance of accidental fall of the windscreen and broken glass.