Emtee
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They are playing a risky game Miles; I hope they have good insurance. The good ones will have a paint thicknesser (electronic tool) and know what they can work with. I would never have done this on a customers car just on demo panels on a show stand.
The fear of a polishing machine is that it will even polish the colour coat, it just would go dull after a few weeks; would this be too late to claim?
Clear coat should be the thickest layer but typically a full machine polish will remove up to 20 um during a paint correction!
Thanks for the wisdom Newton. So without careful use of a paint thickness gauge, a car that's been corrected a number of times really could be in danger of breaking the clear coat and potentially revealing previous 'show-off' seams?