content: I got a small, star crack in my windshield and figured if I could seal it in time it would not spread. This product was recommended to me and the salesman at the store said... it is pretty easy, and works well, but make sure to follow the directions carefully. I must have read them 20 times... so when I was on the step that involved sticking the adhesive ring on the windshield and pressing FIRMLY (directions read, "firmly"), the crack spread in 3 separate places about 4 inches in each direction!! I did not even want to continue but I figure I already bought it to maybe it could at least fill in some of the crack. Moving on with the directions... it said to injected the syringe and slowly push down... while slowly pushing down the sticker made a loud POP noise and the resin dropped down. This product SEEMS like a good, preventative treatment, but it sucks and only makes it a lot worse... and messy.