I agree on coated stone, I have dealt with this only once,and yes methylene chloride is the only thing that will effectively remove it, however if you don't have previous experience with this I wouldn't recommend you practice here.fumes are intense and it is a dangerous chemical.
The second issue is what honed condition was the stone before coating was applied,judging by what I had it seemed coated @ 400, then to completely re-hone
To 3000 ,polish with mb 20 ,to a condition they know ,with the deep "rock star" polish
Is a challenging and very time consuming process .
If this were me I would kindly say thanks but no thanks
At least charge accordingly!! For me will sometimes be as much as replacement
My two cents
Best Regards
Scott Wilson
Sent from my iPad
Just to add you may be able to peel it off
Sent from my iPhone
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