Can attest to sturdyness. I have washed and decased 2 of mine with acetone and they still work as expected. As an alternative to a second key as a backup, you

Can attest to sturdyness. I have washed and decased 2 of mine with acetone and they still work as expected. As an alternative to a second key as a backup, you can always keep a set of printable backup OTP tokens offline in a safe etc, ideally encrypted.