Leaving water in a cast iron skillet for an extended period can potentially lead to damage, especially if the skillet is not properly seasoned or well-maintained. Cast iron is a porous material, and water can cause it to rust if left for too long. Rusting can lead to the deterioration of the skillet's surface and negatively impact its cooking performance.
The exact amount of time water can be left in a cast iron skillet without causing damage can vary based on factors such as the skillet's seasoning, the ambient humidity level, and the quality of the cast iron. In general, it's best to avoid leaving water in a cast iron skillet for more than a few minutes or an hour, especially if the skillet is not well-seasoned.
To prevent damage to your cast iron skillet:
Dry it promptly: After washing the skillet, thoroughly dry it with a clean cloth or paper towel. If necessary, place it on low heat on the stovetop to ensure it's completely dry before storing it.
Season the skillet: Regularly seasoning your cast iron skillet creates a protective layer that helps repel water and prevents rusting. Seasoning involves applying a thin layer of oil to the skillet's surface and then heating it to a specific temperature to polymerize the oil.
Store it properly: Store your cast iron skillet in a dry place with good air circulation. Avoid stacking other cookware on top of it, as this may trap moisture and lead to rust formation.
Re-season if needed: If you notice signs of rust or deterioration on your cast iron skillet, don't worry. With proper care, it can often be restored. You may need to scrub off any rust, re-season the skillet, and continue using and maintaining it properly.
In summary, while minor exposure to water during cooking and cleaning is usually not an issue, it's essential to promptly dry and maintain your cast iron skillet to prevent potential damage from prolonged water exposure.