It will put slight scratches on the paint work jut depends on how hard you press, you shouldnt really be pressing too hard, if the clay is making a hole your pressing too hard, just rub it over with sligh pressure until you feel it slide over the paintwork easily, make sure you use plenty of lube (probablies one of the things people dont use enough of)
once done give it a polish and wax and it should be fine, but most of the time people who use claying usually machine polish it after but they should come out with hand polishing depending on hw hard you have pressed and if thelube was adequate
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