Auto Glass Repair - Summary Guidelines for Repair

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Windshield Repair 101 - Directions for Use

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Auto Glass Repair - Summary Guidelines for 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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Directions for Use Commentary
Windshield Repair Kits provide deep penetrating crack filling resin to restore windshield damage. Very similar to the materials used by professional glass technicians to fill the air cavity with a strong penetrating adhesive that will bond the loose glass and restore visibility.

Quality components are designed to evacuate air from the crack to fill the cavities with specially formulated liquid glass that bonds the loose glass to clear the distortion and works well on many common types of damage including: Stars, Bullseyes, and Chips, preventing further damage and saving replacement cost.

  • For best results, repair soon after the damage occurs.
    If repair will be delayed, cover area with transparent tape to keep moisture and dirt from entering the damaged area. Do not use tape that will leave sticky residue in or on the damage. The resin cannot stick to glass that has an oil or dirt barrier in the cracks or on the surface, and contaminates may also repel the resin keeping it from penetrating the cracks.
  • Surfaces must be clean and dry to make a proper repair.
    The resin cannot stick to glass that has an oil or dirt barrier in the cracks or on the surface, and contaminates may also repel the resin keeping it from penetrating the cracks.
  • Wipe away the dust and dirt with a dry paper towel.
    You can also use a medical type alcohol towelette to clean the glass. If alcohol is used, allow time for the alcohol to evaporate before going to the next step.
  • The damage should be repaired as soon as reasonable to prevent small racks from spreading.
    Vibration and driving torsions will stress the windshield enough to enlarge the cracks if left unchecked.
  • Do not make repairs in direct sunlight.
    The windshield should be shaded from direct sunlight until the entire repair is complete. The resin is UV activated and will begin to harden before you are able to properly inject the resin into the damage if direct sunlight is allowed to hit the resin. Note: if available, you can do the repair in a garage and move the vehicle outside into direct sunlight or use an ultraviolet light to cure the resin after completing the resin injection process.
  • The ideal application temperature is between 50°F and 90°F (10°C to 32°C).
    If the vehicle has been subjected to temperatures outside if this range park the vehicle in the shade and allow it sufficient time to acclimate to this temperature.
  • Do not allow the resin to come into contact with the car's painted finish, wiper blades, or plastic trim or any other important surface as this may cause damage.
    Place a cloth or paper towel near the bottom of both the inside and outside of the windshield, below the damage. This will catch any resin that might flow from the repair area. No resin should flow on the inside of the windshield but its better to be prepared than to chance damage to the dashboard surface.
  • Note: not all windshield damages can be repaired to restore full optical clarity.
Read all Directions before Beginning the Repair.


Follow the guidelines for cleanliness, temperature, and chemical hazards to avoid damage to your car and to ensure a proper repair.

Be advised that the repair can only be done once so carefully follow the guidelines for cleanliness and temperature. The resin will likely act as a solvent if you get it on your paint and then harden leaving a permanent scar on the paint so don't allow the resin to contact these surfaces.

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