The picture shows a batch of paperclay slip that I've poured on to an old bed sheet. I've enlisted the concrete of my patio to help "suck" the excess water from the slip. If you have plaster bats, that will work, too.
My technique take several days and I have to fold/flip the paperclay onto itself many times to facilitate the drying out process. If you are going to be working with moist paperclay, you decide when the paperclay is workable for you. The dried out paperclay can be rehydrated into a workable consistency when the need arises.