Man, a rock just hit my windshield the other day and caused a small crack. The crack isn't very noticeable right now, however I know how quickly those suckers will spider out across my entire windshield. Without having to replace my windshield, does anyone know of anything that can be put on the crack to keep it from spreading? I thought I heard something before about that being possible, but I've never had a reason to look further into it...until now.