A rock hit my windshield on the highway and left a tiny star crack. I used this the same day and it definitely helped stop it from getting worse. Much cheaper than replacing the whole windshield.

The chip didn't disappear completely, but it became far less noticeable. From the driver's seat I barely see it anymore.

Easy to use and the instructions were straightforward. Took about 15 minutes and the repaired spot looks much better now.