The applicator does not need an even coat to give an even coat to the car. For example, if you use a soft style wax, if you get an "even" coat on the applicator, you are probably overloading the applicator and using way too much. In those situations, you will prefer to only grab wax on one third of the applicator. Yet you can still put an even coat of wax on the car.
Now I realize that is not Americana, but in reality, the same concept applies. All you need to is watch where the layer of wax is going and you can make an even coat.