What a Coating Does Not Protect You From
You paid for it and there is still a mark. A coating is a chemical barrier, not armor, and the difference explains every disappointment on this query.
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Clay Bars and Clay Mitts: Is Dragging Clay Across Paint Safe?
Clay works by shearing embedded particles off. That is a controlled abrasion, and the three ways it goes wrong are all failures of lubrication or of a dropped bar.
