FYI GO2 glue from Loctite has been discontinued, I called Loctite and they say this is the closest equivalent:Thanks for posting how to do this. I probably wouldn't have thought of trying to relabel these things on my own. I just relabeled an old hazard switch to an auxiliary light switch using a modified version of this process.
First, I took my icon and mirrored it in Powerpoint. I printed it on regular white paper (laser printer) at work. Then, I printed a regular version of the icon and a mirrored version on 3M clear laser printer labels. Finally, I put one of the laser printer labels on each side of the paper using a light table to perfectly overlay them all. The reason I used 3 overlayed prints was that the backlight bled through the black when using just one.
Finally, I glued the label to the original piece of plastic using Loctite Go2 glue. I tried superglue originally, but it smeared the toner on the labels. Loctite Go2 glue is clear and doesn't smear the toner.
Here's the results:
View attachment 727188
Loctite Crystal Clear Extreme glue