DAMN YOU WCASS !
I am working at home today, and got so excited by your invention that I had to try it with some spare keys I had laying around.
I was very careful to clean and apply the Scotch tape (or so I thought) and the iDye worked well and quickly (first time I have used it).
When I started pulling them out, there were a dozen that were no good, so I thought "well, OK, cool idea but forget it"
but then I fished out a perfect one and OMG! it is so beautiful!
But these 7 are all that I got out of a complete set of letters and numbers.
No telling how many keys and how much dye I will have to waste to build a set. I hate you.