Thank you, Whateve! I really appreciate your advice! And your super quick response - you beat the brownies I was baking, hands down!
The bag looks like it's barely been touched inside or out, so it doesn't seem there's any reason to dunk it then. I will apply Blackrocks as soon as it arrives. Just to be sure - how much would you need to cover an entire Baxter sparingly? I haven't used Blackrocks before so I'm not sure what the consistency is like - would a (US) quarter-sized amount be enough, or too much?
And yes, scratches from fingernails and other things are unfortunately a fact of life. That's actually one reason that I'm drawn to vintage
Coach, though - they can stand up to a beating!
Many, many thanks again!