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Painting or plastering over water-damaged wall plaster is only a temporary fix and doesn’t fix the real problem. If you must, wait until the surface is completely dry before applying a new layer. However, we recommend you remove the damaged plaster and properly perform a repair or hire a professional to do it. Water damage repair is normally covered by your home insurance.

Whether you can repair or install plaster yourself depends on the project size and your tolerance for DIY projects. You may feel perfectly comfortable taking on a small plaster repair project, but prefer to leave a room restoration or renovation to a local plaster repair professional.

Since the project's end result, including its durability and appearance, depend on how well you prepare the wall and apply the plaster, you may want to let a professional take it on if you're not 100% confident.

You can put certain types of plaster over other types, but doing so isn't always the best idea. For example, putting a coat of gypsum over lime plaster is possible, but doing so will limit the lime plaster's breathability and potentially affect its performance.

Since cement plaster tends to leave a textured surface, no matter how much you smooth it, some people prefer to use gypsum plaster as a topcoat over cement plaster, creating a smoother surface.

Plaster is a pretty tough surface, but it can still sustain damage from things like bumping against it, water issues, dampness, extreme humidity changes, and plain old age. Most plaster walls last hundreds of years and will only be taken down to the base layer when major repairs are required. Being cautious around the wall, not placing furniture against it, and ensuring stable humidity are all great ways to reduce possible damage.