I have a late 2011 15" Macbook Pro (though I think my question is more general). I just noticed a small and fairly superficial crack on the glass covering the LCD -- there is no damage to the LCD at the moment. The problem is that since I've noticed the crack it has spread a bit (it's currently about 1.5").
I've seen/heard of people using clear nail polish to patch up windshields (e.g., http://www.ehow.com/how_12152219_seal-windshield-cracks-fingernail-polish.html). Does this work? Are there any tricks to stop a screen crack from spreading?