Clean the wall with household cleaner diluted in hot water, wipe it off with a dry towel and let it air-dry completely.
Mask off the area to be painted with painter's tape.
Spread a dropcloth over the floor to protect it from spills, drips and spatters.
Apply a coat of chalkboard paint over the wall with a roller.
Let the first coat of paint dry for at least four hours, or as directed on the product label.
Apply a second coat of chalkboard paint.
Let the paint dry for two to three days, or as directed on the product label.
Condition the chalkboard surface before using it. Rub a piece of chalk sideways over the entire surface to coat it with chalk powder, then wipe it off with a chalk eraser. Wipe the chalkboard with a damp cloth seven days after painting and repeat the conditioning process. Condition it again each time you clean it with a damp rag.