I had a stone chip on my windshield that suddenly started to grow. “Star” shaped, getting close to an inch in diameter. I called Safelight and they wanted $155 to repair it. I had heard recently that while insurance companies still fully cover these costs that they now consider these repairs as “claims” when increasing premiums. So, I decided to try one of the repair kits, RainX being the one I chose ($15). I was amazed at how well it worked ! Took about 20 minutes (then left in the sun for about half an hour to be sure the resin had fully dried). Virtually undetectable. Wish I had taken before and after pics, even the longest “spikes” in the star disappeared, very happy with the result.