Question: Apply Pressure to the inside of glass
If I do not have a crack expander, is it okay to apply pressure on the inside of the glass to open a crack so the resin will flow into the break easier? Will that work as well as using a crack expander?
You can use thumb pressure on the inside of the glass to flex open a crack but the advantage of using a crack expander is the crack will stay open until you have filled the crack with resin and removed the expander. Flexing with your thumb will open and close the crack as the resin is flowing into the crack which can cause air bubbles to become trapped in the crack.
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 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… Read More