Once again sorry I wasn't here to help! You did the right thing, luckily the other fellers gave you good advice about the black pad. You could have gone to a red pad at most. It probably wouldn't have scratched and wouldn't have clogged as bad. BUT, you got it done. It was coming off in sheets because it was a plasticized finish (epoxy, urethane). You are very lucky you got it off at all. In the future when you see yellowing or peeling, it is usually a plasticized finish, or it is a failing finish due to being on something else such as a, oh I don't know, stone sealer? ha ha. You're learning! Next lesson is how to then sell honing and polishing on that marble now that it's stripped and cleaned. Or maybe you did.....