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Once dried, Venetian plaster becomes a rock-like substance that’s durable and excellent at resisting damage. If properly sealed to resist moisture and maintained, Venetian plaster should last for at least a decade but potentially as long as a lifetime. Thanks to its mineral content, it can also develop a patina.

Yes, to some extent, you can speed up the time it takes plaster to dry and cure. Choose a time of year when humidity levels are somewhere in the middle, neither too high nor too low, to allow moisture to evaporate from the plaster effectively. Also, open a window or set up a fan in the room to improve ventilation.

Don't use a dehumidifier in an attempt to speed up drying time, as a dehumidifier may suck moisture from the air too quickly, leading to crumbly plaster.

Small hairline cracks in plaster walls are not serious and are mostly cosmetic, but larger or widespread cracks indicate structural problems that need repair. 

• Cracks 0.5 cm (0.2 inches) or thinner: Cosmetic cracks you can repair if desired.

• Cracks wider than 0.5 centimeters or widespread cracks: Structural repair is needed, either DIY or by a pro.

• Cracks 2.5 centimeters (1 inch) or wider: Contact a plaster repair professional.

Watch for large, deep cracks, multiple cracks in the same area, and cracks along the walls where they meet the ceiling. Repair these cracks to prevent further damage.

Plaster that sags or bulges, shows extensive deep cracks, or is crumbling from water damage or simply time may need replacement. Plaster walls can look a little “worn” for a long time before they need replacing. The only real way to know if it needs a replacement is to hire a professional to assess the condition of the plaster.