Angie: Repair damaged plaster before painting ceiling
Dear Angie: How important is it to repair plaster before repainting? Our ceilings have peeling paint that we’re pretty sure was caused by past water damage. Since the water problem is no longer an issue, can we simply repaint the ceilings or should we first repair any underlying plaster damage?
Sara S., Elgin, Ill.
Dear Sara: I can appreciate your desire to reduce your workload, but it’s always a good idea to repair damaged plaster before painting.
For paint to adhere properly and look good over time, surface condition and preparation are crucial. You should repair a damaged surface properly and then prime and paint it. If water damage affected the plaster’s integrity, and you just paint over the damage, the paint will likely fail. It might immediately chip and crack or over time it might bubble. Worse yet, because plaster is strong but brittle, a damaged section could fall and even hurt someone.
Before turning your attention to plaster repair or painting, be certain you know what caused the water damage. Make sure to fix any leaks or broken pipes and remove soiled insulation.
Plaster repair can, in some cases, be a do-it-yourself project. But unlike drywall, plaster doesn’t come in a solid sheet. It isn’t as easy to work with as drywall mud because it must be applied in layers and it sets up quickly. Unless you have experience and are confident the plaster area contains no lead paint, it’s a job best left to a pro.
In the case of water damage causing only a stain, without affecting the plaster’s integrity, you should be fine to prime the stained area with a stain blocker, such as Kilz sealer, and then paint. Pros recommend using a high-quality latex paint over plaster. Consider using a satin-finish paint if the ceiling is in a moisture-rich area, such as a bathroom.
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