I'd like to know if putting multiple coats of wax is worth the extra hassle, and the benefits of doing it. I know that putting the extra coat will slow down penetration of bird stuff into the clear coat, but is that really the only benefit? Will the extra coat enable me to not wash my car longer than if I were to only top it off with one layer? Would it yield an even more noticeable shine? Oh, I wash my car once a month and live in Los Angeles where there's lots of dust, debris, etc, and I use M21 if it helps. Thanks

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