Crack Expander Tech Tip

A Handy Tool for a Sticky Situation – Crack Expander Tech Tip

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! You can use a handy tool called the 22425 Delta Kits Crack Expander.

The Design

The design of the Crack Expander is to open cracks in glass. Creating a wider path for windshield repair resin to flow more freely throughout the break. To open a stubborn crack using the crack expander, make sure the center screw is retracted. Just until the rubber tip is flush with the bottom of the base. Moisten the cups with a drop of water or glass cleaner. Then place the crack expander on the inside of the windshield, 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 secured, 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.

The Curing Process

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

After filling the crack, you may complete your repair. 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.

For more information on handy windshield repair tools such as the Delta Kits Crack Expander, visit or call us at (800) 548-8332.

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