how often should i be re applying my carnauba wax

When water isn't beading and when dirt is not cleaning off easily when you are washing. Don't forger to wax your rims too, it'll make it 10x easier to clean cuz the brake dust will wipe off instead of stick to the rim.
 
How often do you wash? Wax every 2-washes, and use a quick detailer after each wash you don't wax.



Protect from bird droppings as good as you can!
 
I'd try to figure out how long it takes for some aspect of the "just waxed vehicle" effect to start diminishing, and then reapply a little more frequently than that, the idea being to stay ahead of the curve.



But if/when I had an outside vehicle, I used much more durable LSPs on it, stuff like Collinite.
 
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