2torial #0658: Learn2 Patch a Hole (Continued) Method 1: Plaster Wall Add the second coat of plaster   Take the time to mix the finishing plaster thoroughly; any lumps will probably be visible in the finished wall. This stuff dries very quickly, and you'll need to apply it without delay. Have a helper standing by to mix up some more if it looks as if you're running out. The finishing plaster is one part water, one part gauging plaster, and three parts hydrated lime. Clean off the plywood and trowel before you begin. Put about two-thirds of the water in the bucket, then mix in lime until the mix looks soft and creamy enough to spread on your morning toast.   Place the mixture on the plywood, and pulverize any lumps with the edge of the trowel. Shape the mixture into a ring, with an open center.   Pour the rest of the water into the center of the ring, and sift the gauging plaster into it; the water will be absorbed. Let it rest for a moment. Don't stir, as this will cause it to set more quickly.   Mix the "ring" into the center with the trowel to combine the elements of the plaster.   Starting from the top of the hole, spread the mixture over the first coat of plaster. Spread some past the edges of the hole to make it flush with the surrounding wall area. Quickly clean the trowel off. Method 1 - Step 4