Crack Expander for Glass Repair

Have you ever run across a stubborn crack where the resin just won’t flow? Maybe you’ve tried a variety of techniques like flexing the glass with a probe, and heating the glass, but still, the resin will not flow through the crack. What do you do? Don’t give up yet! Grab a handy Delta Kits Crack Expander.

The Design

The Crack Expander is designed to open cracks in glass, creating a wider path for windscreen repair resin to flow more freely throughout the break.

How to Use

Open up stubborn cracks using the crack expander. Retract the center screw until the rubber tip is flush with the bottom of the base. Moisten the cups with a drop of water or glass cleaner. Place the crack expander on the inside of the windscreen with one cup on each side of the crack. Make sure the center screw aligns with the crack. Press the suction cups firmly, but gently against the glass.

Once the crack expander is securely attached, turn the center screw clockwise until the tip touches the glass. Continue tightening until you see the crack begin to open up. Exercise caution when creating pressure on the glass. Glass is very volatile, and while the Crack Expander is designed to release from the glass if too much pressure is applied, it is possible to make a crack run before the tool releases.

Once you have filled the crack with windscreen repair resin and have covered it with curing tape, slowly back out the center screw until it is no longer touching the glass.

Complete the repair and cure the crack as you would with any other type of damage. Leave the Crack Expander attached to the glass until the crack has been fully cured. Once cured, remove it from the inside of the glass by the gently pulling up on the release tabs on the two suction cups, or use a nylon stick to remove each cup.

Replacement Parts:

16080 Suction Cup

23531 Suction Cut Hanger Bolt

13300 Stainless Steel Adjusting Screw

13355 Rubber Adjusting Screw Tip (One Pkg of 2)

1 review for Crack Expander for Glass Repair

  1. Rated 4 out of 5
    ( 1 review )

    David C.

    It’s functional

Only logged in customers who have purchased this product may leave a review.

Delta Kits Shipping
  • Orders can be placed 24 hours a day, 7 days a week on the Delta Kits website.  In-stock orders are shipped within 24 hours, excluding weekends and holidays. In most cases orders received Monday through Friday by 2:00 p.m. Pacific Time are shipped the same day.
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Training and Tradeshows

This windshield repair training is a hands-on, intensive, one day course designed to take your repair quality to the next level. Whether you are just starting out or are a seasoned pro, this class is right for you!

Our team of experienced technicians are dedicated to offering the highest standard of training in the windshield repair industry. During the Delta Kits Training and Certification course, technicians are trained to follow ROLAGS (Repair of Laminated Auto Glass Standards), the industries best practices. Delta Kits Training and Certification covers all technical aspects of windshield repair and will take you from never having completed a repair, to being among the best technicians in the industry. The marketing and insurance billing discussion is designed to help you become more successful in your windshield repair business.


Who are our experts:

Heinrich Hermanus from Jerxheim in Germany has been working with Delta Kits since 2003. As a certified Delta Kits trainer, he has taught numerous people how to perform perfect rock chip repairs in the years since 2006. As a Delta Kits distributor in Europe, he speaks German and English and provides valuable services to many customers and users with his clearly formulated tips and instructions, whether by phone, mail correspondence or on-site at the customer.

Graham Watson, is one of the original Novus Technicians in the UK since 1988 and since then has been running a very successful windscreen repair service in the UK. In 2008 Graham was named Windshield Repair Person of the year at the Mobile Tech Expo, an award he is very proud of as it is voted for by his peers in the trade. For the past 10 years, Watson has been active training technicians for the repair industry and specializes in advanced training for techs with previous experience, during this time he has been lucky enough to work with people from many different countries. His passion for helping others carry out the best quality repairs possible shows in the time he spends offering advice on different trade forums as Screenman.