I've never worried about that, no. The oxidation patina on some of my slides gets a little scratched, but that's such a thin layer it doesn't impact anything. I've never noticed any significant scratches on my glass slides. I have one tone-bar but don't play that much lap slide and I could sell my bar as "Like new. Only played by a little old bottleneck player who only plays lap slide on Sunday..."
Maybe someone else has a high mileage tone bar and can chime in.
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Creator of The Parlando Project
Guitars: 20th Century Seagull S6-12, S6 Folk, Seagull M6; '00 Guild JF30-12, '01 Martin 00-15, '16 Martin 000-17, '07 Parkwood PW510, Epiphone Biscuit resonator, Merlin Dulcimer, and various electric guitars, basses....
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