Just did this today, but used a different technique. I opened a new tub of Natty's Blue, grabbed my DAS polisher holding it pad face up and holding the pad stationery. I placed the open tub open end down on the pad, tap the base of the tub and the wax dropped on to the pad. Moved the tub around on the pad and a nice even amount of the wax was applied to the pad. Then holding the bottom of the tub to the pad, invert the whole lot over and take the now upright tub away from the pad. Worked like a charm, essentially think of it like using the tub like a giant lipstick and you've got the idea. Obviously it will probably only work while there's enough wax in the tub to drop by it's own weight, I'll have to use another method when the wax runs low, but until then this works well for me.
Maurice.