When I first ordered my MR-12 Titan II, I had previously read that the labels were difficult to restore. This prompted me to have some made to replace the original. However, I got the size wrong - instead of 1.5" in diameter, I had set it to 1.75" -basically the diameter of the purge button. Here's a photo of the original label and its replacement:
I decided to try to restore the label using my usual technique: remove last bits of paint, spray paint, then using fine wet sandpaper, sand it down carefully. Afterward, to stabilize the whole thing, a spritz of clear acrylic on top:
It came out pretty good
Be that as it may, I still ended up using a replacement label for my reg to keep the original safe. I lightly sanded the outer edge of the replacement to prevent snagging with the box top,and attached it to the whole front of the purge button:
This particular reg will be the back-up for my primary PRAM.