A past issue of Consumer Reports had an article on car wax. It told about some car wax that scratch the paint, some last a long time, others have the best shine, etc. No wax was perfect. I think that the article was about a year ago. You would have to go to the library and have them get out the past issues for you. It's worth the effort, though.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback