When the paint job is not done correctly, ceilings can end up looking patchy and discolored. This can make the final result look unattractive, which no one wants. \
Avoid this problem by taking the time to let coats of primer and paint dry between applications. It's better to take more time than you need rather than to risk rushing the job and end up with a messy ceiling. \
Clean the ceiling and seal any stains that are present, then prime the ceiling, to avoid bubbling or blistering paint. \
Painting the ceiling is going to be a messy job. No matter what, paint is going to splatter down from the ceiling all over everything. \
Thoroughly cover the room where the ceiling is being painted with dropcloths. Make sure every part of the floor is covered because paint will get everywhere and it will get all over you, too. \