| Carnauba wax should last you on average 4 weeks, if you wash weekly and use spray wax or QD. Even under heavy rain or storm it still should last around that time, unless it's an acid rain. Sounds like it's time to try DP selant for you then. I would still wipe down sith water/alcohol 50/50 mix so you can be sure that selant will bond properly.
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1995 Nissan 240 SX SE green metallic (sold)
2000 Acura 3.2 TL white (sold)
2005 Acura RL Desert Mist (weekend toy)
1999 Infiniti I30t white (daily driver)
1997 Acura 3.2 TL (sold)
2004 BMW 325 Ci jet black(wife's car).
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