I was driving today and a rock smashed into my windshield! It was crazy. I thought it was a bullet fired at my window it was so loud and frightening. I don't know how I should go about taking care of this... I know from experience that if not taken care of for a while, these can break the whole windshield. Should I file a claim? And they just inject something into it right? What is it that they inject and how does it work to fix the crack?