Protect your flooring with drop cloths. Remove all of the furniture in the room. Place drop cloths over the flooring and tape them into place along the baseboards.
Tape drop cloths or light plastic sheathing over the walls. Spraying on a textured ceiling produces a lot of splattering. Tape the drop cloths up to the seam of the ceiling and secure the edges and bottoms with more tape.
Fill the sprayer's hopper bin with texture mix. The hopper is typically located on the back of the sprayer. If you cannot find it, refer to the manufacturer directions.
Begin spraying in the middle of the ceiling, using only a spray tip that's suited for use in texture finish applications. A regular paint sprayer tip is unsuitable. Turn on the sprayer and aim at the ceiling. Position the hopper between 6 and 10 feet away from the ceiling. Apply a very light coat of texture and gradually move to the other side of the room. Do not over-apply the texture.
Spray on another two to three coats of texturing. Build up the texture until it has reached the level you desire.