It's not like the genuine YAMAHA ones were that great.
This stuff is used for coffee cup logos, so it's rugged enough to stand up to warm soapy water. Acetone dissolves it in an instant, and you can scratch it with a fingernail, though they say it hardens over time.
A coat of clear would improve ruggedness I'm sure, but I haven't. I can always re-do them if I need to.