Keep in mind that Blackfire Wet Diamond Sealant, like other acrylic polymer sealants, is designed to be applied and removed WET. However, like you guys, my preference is too let it dry before removal, but regardless of the technique you choose, you will still get the great slickness, look, and durabilty.
The only down side of choosing to let it dry is that you must make sure it is completely dry before removal. Depending on how thin you apply it and the enviroment, this will take 15 to 30 minutes on average.
Personally, I apply to the entire car, using either my Flex3041VRG or Porter Cable 7242 with a Lake Country Concours Gold pad. 2 little drops will cover at least 1/4 the car.