Bathrooms can be steamy, wet and stinky rooms, and that can play havoc with ceiling and wall paints. The old coatings may even be stained by mould and mildew. Before applying a fresh layer of paint, it’s vital that you thoroughly prep the components to assist the new paint’s adhesion and total operation.
Your new wall and ceiling paints will not adhere if the old surface is flaking or peeling. Use a putty knife or scraper to remove it, smooth out any pronounced surface irregularities with spackling compound. But beware: If your home was built before 1978, do not perform any scraping unless you’re sure that the walls are free of lead paint.
Wash off the walls and ceiling using tri-sodium phosphate or a TSP substitute. This may remove any spots that are accumulated and degloss the old end. Whether there are any mould stains in the bathroom, sponge them off having a disinfecting solution composed of 1 part bleach to 4 parts water.
Previously painted walls do not usually take a primer, but kitchen and bathroom surfaces have been exposed to high humidity that might cause the next coating to cover unevenly. Several primers are especially formulated for baths and include a biocide which will help eliminate mildew and odors.