How to Stop a Windshield Crack from Spreading

• A windshield repair kit is the best way to fix small nicks and cracks.
• Filling a crack with super glue or nail polish is a common method of stopping a crack from spreading.
• Applying clear tape over a crack will prevent more debris from entering the crack and making the problem worse.

Using Super Glue or Nail Polish

Clean the windshield with glass cleaner. Apply window cleaner to a rag or microfiber cloth. Rub the rag or towel over the cracked area to remove any dirt or debris. Allow the windshield to dry completely before you move on to the next step. Be sure not to spray any cleaner directly on the area, as this can get inside the crack and interfere with the repair process.

Use a small, sharp object to clear any debris from the crack. Once the crack is wiped clean, find a push-pin, sewing needle, or another thin and sharp object to insert into the crack and carefully nudge any debris like glass or dirt out from the crack.

Apply super glue or clear nail polish to the crack. Carefully squeeze a small amount of super glue into the crack—just enough to fill the crack without causing a mess. Then, carefully wipe away the excess liquid with your cleaning rag. Let the glue dry for at least two hours before getting back on the road. If you’re using nail polish, be sure to use clear nail polish so that the fix is transparent and not too distracting. Super glue and nail polish fill the crack and help prevent further damage, but they're not permanent solutions. You'll need a repair or even full replacement in order to completely fix any chips or cracks.

Applying Tape to a Crack

Use glass cleaner to clean the windshield. Spray a microfiber towel or clean rag with window cleaner. Gently rub the rag or towel over the cracked area so the space around the crack is free of debris. Allow the windshield to dry completely. Don’t spray the glass cleaner directly onto the damaged area, as this can interfere with the repair process.

Remove small debris from the crack with a push pin or other sharp object. After you clean the windshield crack, find a push-pin, sewing needle, or another thin and sharp object. With the sharp end of the pin, scrape out any debris that might have found its way into the crack, including glass or dirt.

Cover the crack with tape. Use strong, clear tape, like packing tape, to seal the crack. Make sure the crack is completely covered to prevent any further dirt or debris from finding its way inside. Use transparent tape that will allow you to drive and see through your windshield without too much distraction. Tape will only cover the crack and can help prevent further damage, but don’t stop there. Use a windshield repair kit or visit an auto body shop to fully repair or replace the windshield.

Using a Windshield Repair Kit

Purchase a windshield repair kit. The best way to stop a crack is to fix it! Windshield repair kits are available at most auto shops and hardware stores and are a cost-effective way of removing any chips or small cracks. Syringe adhesive kits usually include adhesive liquid and a syringe, and involve injecting the adhesive into the crack with a syringe. Suction adhesive kits typically include a resin formula to inject into the crack, as well as an applicator that suctions to your windshield.

Clean the windshield and remove debris from the crack. Spritz a rag or microfiber towel with window cleaner. Gently rub the rag or towel over the cracked area to remove any dirt or debris. Then, use a push-pin, sewing needle, or another thin and sharp object to gently remove any debris. Allow the windshield to dry completely. Careful not to get any window cleaner inside the crack itself. This can interfere with your repair!

Apply the resin or adhesive with the included applicator and let the area dry. Once the damaged area is clean and free of debris, insert the adhesive into the kit’s applicator. Then, position the applicator directly above the crack and carefully inject the adhesive into the area and let it dry. Each kit comes with its own particular instructions and methods, so be sure to follow the instructions included in your particular kit!

Protecting Your Windshield From Further Damage

Avoid rough or bumpy roads. Too much jerky motion can disturb the crack and cause it to spread. Use a GPS to alter your route to avoid bumpy roads that may cause the crack or chip to become worse.

Avoid driving in the rain. Rain can carry small debris that might find its way into the crack and cause more problems. Try to drive only on clear, dry days in order to prevent further damage to your windshield.

Park under a shelter to avoid severe temperature changes. Severe temperature changes can also affect existing windshield cracks. Keep your car indoors if possible in order to keep it at an even temperature. If you can’t park inside, try parking in the shade, or in the same location from day to day.