Worn Out Buttons

I was at Changi Terminal 3 and used the AXN machine to make payment to my credit card. I noticed that the buttons were well used. It reminded me of my time as a design engineer when I encountered the same problem. The root cause then were (1) customers had used moisturiser on their hands (likely given the profile in Changi Airport) and (2) no UV coat to protect the paint on the button.

Experienced Button/Engineer