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Drying alone can take 1 to 4 hours to dry to the touch per plaster layer, but some types of plaster take several hours longer to dry. However, this doesn’t mean the job is done because plaster doesn’t fully harden until it cures, which can take a few days to a couple of weeks. It may take even longer if you’re building a new, pretty thick plaster wall. Allow the plaster to cure before painting it.

If the water damage is small, such as small patches, you can paint over the area. To prevent mold growth, roll on a coat of an antifungal primer beforehand painting. However, if the damage is more extensive, you may have mold, and the plaster will be compromised. You’ll have to replace the plasterboard.

Plastering comes at a higher cost than installing drywall, but it also provides some pretty enticing benefits. First, plaster usually lasts longer than drywall, so long-term costs will usually be lower. Second, plaster is a highly insulative material, so it might help make your living area feel more comfortable and keep your heating and cooling costs lower, especially in the summer and winter. Finally, plastering is naturally textured, so it helps hide imperfections and often adds warmth to your home that drywall won’t.

It’s not a good idea to plaster over broken plaster (unless by broken you’re referring to cracked, in which case that’s perfectly fine). However, broken plaster can be a sign of a larger underlying issue like foundation damage or severe damage to the lath holding up the plaster, so it’s worth investigating before you simply plaster on top of the damage.