Which megs detailer did you use? I've found that megs ultimate quik detailer is very good and provides plenty of slick. On a freshly waxed car, you shouldn't need more than Megs uqd.
If you find the above is not enough, I've been known to bring to a show x2 5lt bottles of drinking water, car shampoo and a bucket. Not so easy in a Zed mind