I have some elderly relatives whose keyrings have engraved stainless steel tags with address and a contact number on them, for Just In Case cases. However, they're being badly mauled by being attached to keyrings, which is otherwise the ideal place to put them because they'll always carry them when they're out. The obvious solution is some sort of hard coating, but I'm not sure what would work best, it has to be resistant to scratching so the engraving details can be read through it, but also protect the tag from damage by the keys around it.

 

 

Does anyone have any suggestions, preferably not too expensive since I only need a cover a few square cm of material? I've got some conformal coating, but I don't know how wear-resistant that is, and then there's an endless variety of clear cover paints, e.g. Mitre10's Home Projects Enamel Satin Clear for $8 which is presumably some OEM brand for which I can't find any details apart from "conveniently sized for small projects". Beyond that there's stuff like PlastiKote Clear which is "Hard-wearing" and "Scratch-resistant", but at that point I'm gambling $15-20 a pop on one of the things I try being appropriate.

 

 

Which is why I'm asking here...