I used this product the other day on the ZR1 and can give it a thumbs up. Sometime during the summer of 2020 was driving the car and picked up a rock chip on the w/shield. It was not big and wasn't a star hit or bullseye just a ping on the w/shield about 2mm diameter and not very deep. I thought nothing of it but decided to visit a Speedy glass to see if they could repair it. As it wasn't deep enough for them to repair using their method they told me it was not necessary to repair at that time and if it does start spreading and/or gets worse then come back for the repair.
Deep inside my head I'm thinking "well, the whole idea of wanting it repaired was so that it doesn't spread and or needing to replace the w/shield".
Fast forward 3+ years, the rock chip didn't spread but seeing it really bugged me this whole time so the search was on to see what can be done. So on YT saw a few vids using this product on rock hits that were way worse and the repair looked good. It didn't totally remove the bullseye or star chips in the vids but made it look a lot better and better than them getting worse and spreading.
So I bought a kit and used it the other day and was very impressed, again my chip was tiny and it is practically gone. You have to be really close up on the w/shield in that area to see a tiny tiny mark where the resin went but for all intents and purposes the chip is gone.
I have to say C7 windshields must be thinner than other glass, specifically when compared to C6 cars as I had a Z06. I remember a few rocks pinging off the glass in my C6Z and noticed not even a mark on that car but the C7 glass is fragile.