To preserve plaster of Paris, the most critical step is to eliminate direct contact with water.
Plaster of Paris is a delicate material, especially when exposed to moisture. Understanding how to protect it will ensure your objects, sculptures, or surfaces remain intact for a long time.
Why Water is the Enemy
As highlighted in preservation guidelines:
- Water will cause the exterior surface of plaster to soften and crumble as the plaster begins to dissolve.
This means that even seemingly minor exposure can lead to significant damage, compromising the structural integrity and appearance of the plaster object or surface. High humidity environments can also pose a risk over extended periods, but direct water contact is the most immediate threat.
Practical Steps for Preservation
Protecting plaster of Paris primarily involves controlling its environment to prevent moisture exposure.
Here are key actions you can take:
- Keep it Dry: Ensure plaster objects are stored or displayed in a dry environment away from sources of moisture like leaks, spills, or high humidity areas (e.g., bathrooms, damp basements).
- Elevate from Potential Flood Sources: As recommended for preventing damage from flooding, keep objects elevated at least 6 inches off the floor in case of water intrusion.
- Avoid Overhead Water Sources: Don't store objects directly under fire suppression sprinklers or leaky pipes, as these pose a direct risk of sudden, significant water exposure.
- Control Humidity (Optional but Recommended): While not direct contact, consistently high humidity can weaken plaster over time. Using dehumidifiers in storage or display areas can help maintain a stable, dry environment.
- Handle with Care: Plaster can be brittle. Handle objects gently to avoid chips or breaks, which can create vulnerable spots.
- Clean Carefully: If cleaning is necessary, use dry methods like soft brushes or vacuum cleaners with low suction and appropriate attachments. Avoid wet cleaning entirely.
By rigorously avoiding water contact and storing objects in a stable, dry location, you can significantly extend the lifespan and maintain the quality of your plaster of Paris items.
