Exactly, my brother works on power lines and wears many different types of gloves, all his computer tools are button actionated.

That's me. I'm a double bassist, a kind of blue collar laborer. ;-) It's worst during the winter. It's a shame because I prefer to use a touch screen on my laptop.

I'm not a labourer in the slightest, but I'm a rock climber though. Sometimes for up to two days after a strong session the finger print reader on my keyboard doesn't work. It always eventually starts working again :)

Even indoor bouldering has had an effect for me - my thicker skin just doesn't always register well on my phone screen.

I worked in a fast food restaurant before college. I would be on the closing crew about three or four days a week. I would usually be the one washing and scrubbing the crusty broiler parts every time.

When I got to college, they gave everyone Thinkpads with fingerprint readers. Mine had trouble reading my fingerprints for about 2 months. I guess that I scrubbed my fingerprints away with all that grease, and it took that long for my fingerprints to "regrow" enough for the sensor to recognize them.