As some backround info, I typically use PS21s as my wax.

So I've always been under the impression that carnauba just won't bond as well when its cold(<60*). What do you guys think? I've typically done sealants for the winter, then saved carnauba for the better weather not only because I think it pops better in the time of year that people check out cars, but because there was some chemical bonding reason that the wax didn't stick as well.

Thoughts? I'm putting my car through a detail this weekend, and am trying to decide if another layer of sealant is the way, or if carnauba will actually bond in the 40-50* weather.

 

I myself still apply Souveran on my car and gets lows as 39 and I see nothing wrong. It will still bond but going to take a little bit longer.

 

Humidity affects the application because Carnauba is inherently hygroscopic (absorbs moisture) if you notice dark streaks during the application of Carnauba waxes, it tells you that the humidity is high. This will also retard the set-up time, usually, if the car is left in the sun for a few minutes after the wax has been applied the streaks will disappear. Windy conditions affect the curing of the wax because winds move more oxygen across the waxed surface, curing it faster. If you must wax your car on a windy humid day, wax smaller sections at a time (one foot by one foot, 1ft = 12").

Surface Temperature (Actual surface temperature of the vehicle) between 50oF (10oC) and 80oF (26oC) products will work well within a much broader temperature range, i.e. 45° to 90° F (4.5-32oC) but at 45 degrees it will take much longer to dry, perhaps as much as two to three hours) but the best results will be achieved in the 60° to 70° F (15-21oC) range surrounding air temp (ambient or room)