I waited a day between coats of SG using the WOWO in the ohio fall...
But i topped the third (and final) layer of SG with #16 after waiting only an hour.
I did all that about a month ago, if you live in central ohio you know how much rain we've gotten in the last month and my car still hasnt stopped beading. Also, the three times i've washed my car since, i could have used only water, the dirt just didnt stick to the car. (If you can consider that a testiment to my application method)