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a sharpie on the tank itself, or on one of the inspection stickers? i figure a sharpie on the tank itself would be hard to get out if you ever want to sell the tank.
DEET is nasty stuff indeed. Alcohol should do the trick as well.A little squirt of OFF! will get rid of a Sharpe mark. Imaging what that stuff does to your skin?
.... if you ever want to sell the tank.
My tanks have black boots. I write my name in huge letters on the boot, so it's visible from the back when I don my gear. I use a silver sharpie or a paint pen. I used to do a lot of boat diving so I wanted to make it easy for the boat crew to ID me. It was also easy for the dive shop staff to find my tanks when doing fills.