Dust can be a problem when painting. If there is dust in the air then it can settle on fresh paint, and ruin the finished surface. This is a bigger problem with horizontal surfaces than vertical walls. It is also a bigger problem with slow drying paint; the longer the drying time the great the amount of dust that will settle. Removing the dust form the air will almost always benefits, and never disadvantage any painting.
- Vacuum all floors and surfaces in any room before painting. This is especially important for ceilings. Make sure the vacuum is not releasing the dust back into the room.
- Vacuum flyscreens and blinds, or remove these before painting.
- Clean any fans, especially ceiling fans, in the room. These harbour dust.
- Cover any bookshelves or furniture which will harbour dust. Anything with small and uneven surfaces (knickknacks, shelves …etc.) are an issue.
- Cover the floor, especially carpeted floors, with groundsheets.
- Use a fan to blow air out of the room when painting. This also helps dispel fumes.
- An air filter will remove a great deal of dust; Use this the night before painting.
- If possible then raise the humidity of the room. A dry room harbours more dust. More water content in the air means less floating dust.
Modern paints that are water based and fast drying will have less issue with accumulating dust. When a painting job is done professionally there should be no issue with dust getting stuck on paint.