I bought the Swanson's brand, and the instructions say to spray 4-5 times on your skin, rub it in, and then rinse off thoroughly. (I have no connection to them. Billy E recommended that brand and they were cheaper than some others I looked at.)
My questions for you are:
How long do you wait to rinse it off? I waited about an hour last night, which I arbitrarily figure is reasonable. Would it absorb better if I waited longer?
Is it important to rinse it off? And if so, why?