How to fix a broken nail! Take a tea-bag and empty it. Cut a small piece to fit your crack. Apply a base coat on the nail and, while it is still wet, apply the cut piece.Then, apply any nail polish you like.
"DIY: Fixing Shattered Pressed Shadow" by beautylish on Polyvore (I use the end of a chubby-handled brush instead of a fabric wrapped coin. But the alcohol does the trick! Kills germs and drys quickly to reharden blush, eye shadow, bronzers, etc!