I prefer applying the NOW Moroccan red clay powder mask with a brush. Leaving it on for about 15 minutes. The mask doesn’t have to dry down until you remove it. Just rinse it off after 15-20 minutes and the mask has done what it is supposed to.
I remember reading a review that someone said that it colored their skin, I have never seen that happen to me though. But be sure to rinse until the mask is completely gone.