I always wipe my fender off and the suction cups with a micro fiber towel before putting it on and have not yet left a ring or scuff in the paint.
If it is perfectly clean, it wont scratch, oh... and don't lick the cups before putting it on!!:lol:
Just because they call it a lick-n-stick doesn't mean you do it. If those pads are wet, they will slide arond and scratch the paint. Put them on clean and dry.
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