I like this idea. My 2 series had marks on both sides with no paint after 10 years of use, many with heavy soled boots. Might do this on my new 3 series. Like you said, $3 is short money.Also on Sunday I installed some scuff guards on my lower fenders. For some reason my heels keep rubbing against them and I have some serious scuff marks.
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Used this from Harbor Freight. Not completely sold on the idea but figured for $3 is was worth a shot.