How to Replace a Car Windscreen

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First of all, you will need to purchase a new windscreen from an original parts dealer or a reputable after-market distributor whose glass meets the vehicle manufacturer’s safety standards. It is important to make sure the windscreen being purchased is free of any defects, purchasing a second-hand glass can be risky as defects are difficult to see to the untrained eye.

Once the new windscreen has been purchased you will need to prepare it for installation. First you will need to clean the windscreen with window cleaner taking extra care that the outer black ceramic is free from any dirt, dust, and grease. Next, you will need to prime the black ceramic with a primer specific to the urethane that will be used to install the windscreen using a lint-free cloth. Once primed you must never touch the area with your hands as oil from your fingertips can affect the urethane from bonding to the glass correctly.

After the windscreen has been cleaned and primed you will now need to fit the correct moldings to the glass whilst wearing a pair of powder-free latex gloves. Then the rear view mirror is detached from the vehicle and attached to the mirror button, which is glued to the new windscreen with a purpose-made two-part adhesive.

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Remove the current windscreen from the vehicle. To do this, first, remove all surrounding molds from the bottom plenum chamber and windscreen wipers. Once all moldings have been removed you will need to use a cold knife also known as a “drag knife” to cut the existing urethane bonding the top and both sides of the windscreen. Once the bond between glass and urethane has been broken use an Olfa knife or BTB knife to cut the bottom section of the glass from the urethane whilst inside the vehicle.

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Once the connection between the windscreen and the car is broken, connect the windscreen with suction cups and preferably two people, as the windscreen is heavier than it seems. After removal, cut the old urethane from the car body with a sharp knife, such as an Olfa or BTB knife, so that 1-2 mm of urethane remains on the body.

Clean the top of the car to remove all dust, dirt, and grease, and then apply a black urethane body-specific primer to the body surface to remove any scratches and exposed metal surfaces. the face will be covered as it will prevent the body from rusting.

Using a large sealing gun, apply certified automotive urethane to the surface of the primary glass and ensure that the bezel remains the same length around the perimeter of the windshield without holes.

Place the suction pumps on the outside of the windscreen and, with the help of two people, place the windscreen in the correct position of the car to ensure good contact between the body surface and the urethane. Once in the correct position, hold the entire windscreen slightly and place the tape from the windscreen to the roof of the car to stop unnecessary movement.

Connect all necessary strips, the pressure chamber, and the windscreen wiper on the car and clean the outside of the windscreen. Close one of the door drains before closing, as the pressure when closing the car door will affect the unhealed urethane, as it is the weakest point in the repair and may leave a hole in the air pressure seal.

Wait for the approved driving time for the specific urethane used (usually one hour) Remove the windshield carrier tape, then stand up and turn off the newly installed windshield.