Nail polish……
I mean “Hit the Floor Pure Ice” (brand name) from Wally World. Candy Apple Red with metal flakes….
I carry a ton of key rings for different buildings…
I coat the edge of the top master key so I can see which one it is on the ring when I am carrying stuff in both hands and need to open the door quick.
Its really fast dry laquer paint. I know techs that have carried it for safe door repairs etc. for years.
No, I do not do my nails with it…