There was only one mishap. Jack the Dog, my Newfoundland, was standing at the base of the ladder looking up at me when about 8 ounces of wet plaster fell off my palette and landed squarely on his head and muzzle. Against his black fur it looked like he'd been smacked in the face with a custard pie. So there was a quick diversion to the back yard for a bath before the plaster dried. He took both ordeals in good spirit but when I got back my batch of plaster was hard as a rock. So I had to run out for another bag.
If you're new to our three-part closet drama, Episode One was the framing. It was followed by the exciting tragedy in Part Two: the skinning, or the Drywall Strikes Back.
Anyway, I cut my homemade knife to the profile I needed from a scrap of masonite. I gave it a couple of coats of urethane to seal the open edge and to keep the wet plaster from sticking to it. I drew a vertical pencil line on the wall as a guide for the outside edge of the knife. Then I painted two coats of Quikrete bonding adhesive on the wall.
Plaster should be applied over a tacky bonding agent so before the second coat dried I mixed up a bag and a half of plaster and water spiked with a half cup of white vinegar to retard the plaster from setting too quickly. I made the mix a little wetter than normal so the knife wouldn't gouge the plaster.