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Windshield Repair - Long Cracks - Making the Repair

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Windshield Repair - Crack Repair Instructions - Pg 1
Windshield Repair - Long Crack Repair Directions
  1) Long Cracks
  2) Parts List - Pg 1
  3) Making the Repair - Pg 1
  4) Making the Repair - Pg 2









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Windshield Repair - Long Cracks - Making the Repair
Learn how to repair windshields with our free course on Windshield Repair. Know which Windshield Repair Kits are available and which kits fit your repair needs.

Be informed by seeing a comparison of the kits and processes before you begin, and be able to determine whether a windshield can be repaired or needs to be replaced.

These kits are used to repair bullseye, spider web, star, chip, and combination windshield damage. Some kits can repair cracks. See kit comparison chart for specifics.

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Windshield Long Crack Repair:

  1. Preparation for Repair
    Move the vehicle into a shaded area. Repairs must always be preformed in shaded areas and on windshields that have been shaded long enough that they are not warm or hot to the touch. There must not be any UV or sunlight directly on the windshield during the repair process.

    Place cloths near the bottom of the windshield below the damage on the inside and on the outside of the windshield. This is to protect the car's finishes in the event that resin runs down the windshield on either side of the glass. It is best to have a drop cloth covering the painted surfaces such as the hood in around the repair area to a distance that if a part were dropped or resin dripped from a part it would land on the cloth and not on the vehicle.

  2. Remove Loose Glass
    Clean or remove any loose pieces of glass from the damaged area with the pushpin or razor blade. Do not touch the glass with your fingers as this might leave oil on the glass.

  3. Clean Damage Area
    Clean windshield around the damaged area with a dry cloth or alcohol towelette if provided in kit. Do not use any alcohol products that may have perfume or oils added. Make sure the area is dry and clean before moving on to the next step. If an air supply or canned air is available, blow the damaged area to ensure no dust or debris remain in the area to be repaired. (DO NOT Blow directly into damage at close range as this could damage your windshield.)

  4. Deposit Resin to the Crack
    To open resin container; remove cap from the container, and away from painted surfaces carefully cut off approximately 1/8 inch or less of the tube tip using the enclosed razor blade or a pair of scissors. Cut off only enough of the thin end of the tip of the resin container to open it.

    Be sure to have some curing strips handy, and ready to place over the resin. Start from one end of the crack, preferably the lowest end of the crack, and very slowly dispense repair resin directly on the crack. Dispense the repair resin only as fast as the crack is disappearing, about 1/8 inch per second. Surface tension will cause the crack to act like a capillary tube drawing the resin into the crack. Do not get ahead of the resin flowing into the crack as this might capture an air bubble in the crack.

    Look at the crack from a 45 degree angle to the side of the crack to see the shaded or dark area filling with the repair resin. Be patient, allow the resin to be absorbed into the crack.

    If air pockets still remain in the crack after 5 to 10 minutes, then apply a small amount of pressure from the inside of the windshield, to both sides and center of the crack to spread the crack slightly. This will help the resin to flow into the crack more freely forcing the air out of the crack. If you have a crack spreader, you could attach it to the inside of the windshield to spread the crack slightly before applying the resin. Minimal pressure should be added to the inside of the windshield in either case since excess pressure will extend the crack.

    Examine the repair area from both sides of the crack at a 45 degree angle to see if any parts of the crack are still visible. If necessary, repeat dispensing more repair resin and gently applying pressure from behind and along the crack until no dark areas are visible.

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