If I put a coat of wax on last weekend and I do another coat of wax this weekend with it count as a double/thicker layer?

Also If I wash less, I beleive the wax coating stays on longer...true?

This is for a 99 C230K

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98 S420
99 C230K
01 C240

Yes, if you are using 100% wax. If your can/bottle says cleaner wax then no, you just removed part of the original wax and put some more on. Try not to think of wax in layers - think of it as covering more of the tiny pores in the surface of your paint.

Also If I wash less, I beleive the wax coating stays on longer...true?
Somewhat subjective depending on other factors like your environment.

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