Crack Expander for Glass Repair

The Crack Expander is designed to open cracks in glass, creating a wider path for windshield 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 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 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 windshield 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.