Damn thanks for sharing. I will need to try nail polish to help my process relabeling my PdC chips! Here is a video with the technique I have used for newer chips. I have noticed that the sticker part will peel off easy when it is somewhat attached to the plastic.
Unfortunately I have found only one in 30 comes off like the one you showed. Pulling the plastic cover off slowly pulling up on the label underneath does help. It can still be a pain getting the remaining pieces off without the nail polish remover (non acetone only though).
For Canadians I have found that the London Drugs brand works the best.
Thanks,
Grant