Old fashioned plaster ceilings occasionally need to be re-plastered. In some cases, you may have constructed a new ceiling as part of a home remodeling project. The plaster will better match the style of the home than drywall. For a fast application over a large area, you can spray the plaster on. Ceiling plaster can be applied by almost anyone, although it is a messy project.
Prepare the Room
First, you will need to tape off the walls and hang plastic sheeting. This is to protect the walls from falling plaster or over-spray.
Mix the Plaster and Load the Sprayer
Mix the plaster according to the instructions. Mix it thinly enough so that it will flow easily through the spray gun, but thick enough so that it will stick to the ceiling.
Place the plaster in the hopper. Try a few experimental sprays on a piece of cardboard or paper to make sure you have the correct spray nozzle setting and that the plaster flows easily through the gun. Make any needed adjustments to the nozzle and air compressor.
Spray the Ceiling
Begin to spray the plaster on the ceiling with even, sweeping strokes. Start in one corner and slowly work your way outward and across the room. Each pass with the sprayer should overlap the last pass to create an even coat.
Check Your Work
Once you have finished spraying the plaster, take a bright light and shine it on the ceiling. Look for any blank spots that you have missed. Continue spraying the ceiling until the entire ceiling is covered and plaster has been completely applied.
Dry and Finish
Let the plaster dry for at least 24 to 48 hours. Prime and paint to the desired color.