Originally Posted by Mister Earl

I highly, Highly, HIGHLY recommend AGAINST doing just this. I did this to my own windshield, convinced that it would stop a crack from growing up my windshield. Instead of going up, it branched out, and now crosses the lower half of my windshield. Almost all the way across, both ways. I took a 4 inch crack and extended and redirected it to a few feet total. Not a good idea!