If your bathroom is not well-ventilated, you may begin to notice changes in the ceiling. Black spots caused by mildew may appear. Worse, scratches in the paint on the ceiling may allow water to seep into the ceiling. This may cause the paint to bubble or the plaster to crack. Repairing ceiling damage in the bathroom can be done, but the damage may reappear if ventilation isn't improved. Consider installing a fan in the ceiling to prevent further issues.
Instructions
1. Clean any black spots from the ceiling by mixing trisodium phosphate and water in a bucket. Wipe down the ceiling with mixture. Wipe the area down with diluted bleach, using a sponge to remove any excess mold.
2. Scrape bubbling or damaged plaster, using a putty knife. Break away as much of the plaster as possible.
3. Put a large glob of putty onto a painter's palette.
4. Apply some of the putty to the ceiling, using a wide putty knife. Scrape the putty out and away from the crack, feathering it, so the patch is smooth. Allow the patch to dry overnight.
5. Sand the patch with 120-grit sandpaper to make it smooth, removing the feathering at the side of the patch as well.
6. Apply another application of putty, using a wide putty knife to fill the patch if it sank while drying. Feather out the application again. Sand once dry.
7. Apply a bathroom wall primer with a primer brush, then paint with a water-resistant paint for bathrooms and a paintbrush.
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