Quote Originally Posted by yellow
I think I read this somewhere, but I've heard it recommended that you put your fingerprint permanently on the bike. On some spot not readily visible, get a good print on there somehow and then cover it with clear nail polish or the like. That way it's not readily apparent to a thief and you have a sure way of identifying it as yours. I think I could probably get a good print after one of my intensive chain cleanings!
This is something we've done with our bikes only we used the clear lacquer to create the fingerprint.

Put the lacquer on an inconspicious spot - under the top tube - I have my print on the inside of the chain stays. Apply the lacquer (clear nail polish) and allow it to get tacky. Then put your thumb print on the polish and let dry.

Hopefully we'll never need to rely on the thumb print as identification but it's nice to know it's there.