Lots of us spend plenty of time on the road and we all have gone through construction or driven behind or by someone throwing rocks from their tires. So cracked windshields beware!!
When a rock hits your wind shield and makes a crack, put clear nail polish over it before it spiders out. We had a friend tell us about it years ago and tried it. We have done it a couple times and not one has spidered on us. Our first try was 4 years ago and it is still holding up great!! I actually have a clear nail polish bottle in our glove compartment from the time before when we went to the store quickly to make the cheap repairs... so it is close and handy:)
So give it a try the next time you get a crack in your windshield, but the key is the clear nail polish has to be applied before it spideres!!