Sand the walls lightly with medium grit sandpaper brush them off with a dry cloth and vacuum up all residue.
Sand bathroom walls before painting.
For other small imperfections on the wall such as plaster bumps smooth them away with sandpaper.
When painting a bathroom or kitchen wash the walls with a solution of approximately three teaspoons of laundry detergent to one gallon of water.
Wall dirt makes it difficult for paint to stick to the surface so make sure your wall is spotless before you start painting.
Again wipe away any debris and allow to dry completely.
Wear rubber gloves when using tsp or a bleach solution.
Alternatively dilute concentrated tsp trisodium phosphate cleaner with water as directed.
Using a pole sander fitted with 120 grit paper sand the walls make sure to wear a dust mask.
Scrape any cracked or flaking paint with a paint scraper.
For previously painted water based paint sand with a fine grit sandpaper.
Don t sand so hard that you cut into.
Even careful diyers are tempted to bypass this step when the walls appear to be clean and in good shape and many do it yourselfers don t bother to clean in any way instead opting to simply slather paint over the walls.
Sweep the sander side to side as you work your way from the top down.
Dust and sanding debris will mar your wet paint.
For stubborn stains try baking soda a substance that s used to clean everything from sinks to toilets.
No diy advice is ignored as often as the recommendation to thoroughly wash the walls before priming and painting.
Always sand and paint the ceiling completely following these same steps before addressing the walls.
You can always tell when an uneven surface was painted because you will see darker and lighter patches on the wall.
Smoothing walls before painting is necessary for surfaces previously painted with a gloss or high gloss paint.
If your bathroom has a window open it.
Tsp is a stronger cleaner.
Sanding a wall before painting is part of the cleaning process.