I have been using it for over a year now, i sand to 230 grit and apply the oil with a paper tissue that i burn after use. the sponges are too expensive in the way of being single use, and oil thirsty. I wait a couple minutes and wipe the excess oil off, and wait again 20 to 60 minutes for the oil to penetrate enough before going over it with the green vlies pad. If you use the vlies too rapidly it will load instantly with goo and become ineffective, i suspect these are intended to be single use as well. But i manage to use em on 4-5 projects.
for the second coat i wait at very least 24 hours, and often i should wait more because the oil hasn't cured enough to be sanded again with 230 grit which gives a much smoother finish. Then i apply the oil again and repeat the process, except that i use a white vlies pad.
I have the impression that if you use it by the books, that you need to spend over €10 on consumables (sponge and vlies pads) per project!
I am sold on the vlies pads, and like the applicator to spray the oil, but have completely given up on the sponges.