After talking with a few older *gurus*, they all seem to say the same thing. Leaving SG on as long as possible is the best way to go. A minimum of 30 minutes, but several hours is even better. Evidentally, there is a window of time where SG is going through a *hard to remove* stage, and you can either remove it before this stage (i.e., WOWO method) or you can leave it on for the duration and it comes off just as easy. So far, I've only used the wowo method, but in the next couple of days I will be applying to the whole car and letting it sit for an hour or so and then remove it to see how that works. I find the number 1 biggest determining factor in easy removal is ambient temp. and humidity. If it's too hot or too humid, this is just a pain no matter what you do. In the end, it's all person preference.