Is your cast iron skillet constantly rusting? Don't worry, you don't have to give up on it! Rust is often caused by a few common mistakes that are easy to fix. Discover the 5 reasons your cast iron skillet keeps rusting and learn how to prevent it. From proper cleaning and drying to maintaining your seasoning and storing your skillet, these simple tips will help keep your cast iron protected and in great condition for years to come.
There's nothing more frustrating than pulling out your cast iron skillet, only to find rust spots on the cooking surface. Whether you use it every day or just occasionally, seeing rust on your favorite pan is never a welcome surprise. The good news? A little rust doesn't mean your skillet is ruined. In most cases, it's easy to remove, and with a few changes to your cleaning and storage routine, you can keep it from coming back.
So, why does your cast iron skillet keep rusting? From improper drying to damaged seasoning, there are several possible reasons. Here's what might be causing the problem and how to prevent it.
Why Does Cast Iron Rust?
Cast iron is made primarily of iron, which reacts with water and oxygen to form rust. Unlike stainless steel, it doesn't naturally resist corrosion. That's why seasoning is so important. When oil is heated on cast iron, it forms a protective layer that helps prevent moisture from reaching the metal. It also creates a smoother cooking surface. Over time, this layer can wear down, leaving your skillet more vulnerable to rust. Fortunately, with the right care, you can keep your cast iron in great condition for years.
5 Reasons Your Cast Iron Skillet Keeps Rusting
Here are five common reasons your cast iron skillet keeps rusting and what you can do to prevent it.
1. Not Drying Your Cast Iron Skillet Properly
This is probably one of the easiest mistakes to make. You wash your skillet, give it a quick wipe, and put it away. Seems harmless, right? Unfortunately, even a little leftover moisture can cause cast iron to rust. Water can settle in small areas of the pan, especially around the edges and handle. If your skillet isn't completely dry before you put it away, rust can start to form.
How to Prevent Rust by Drying Your Cast Iron Skillet Properly
After washing your skillet, dry it immediately with a clean kitchen towel. To make sure there's no moisture left, place it on the stovetop over low heat for a few minutes.
Once it's completely dry, you can apply a very thin layer of Caron & Doucet Cast Iron Oil to help protect the surface. A little oil goes a long way. Applying a thin layer after cleaning can help protect your skillet, especially if you live in a humid area or don't use it every day.
2. Your Cast Iron Skillet Has Lost Its Seasoning
If you've noticed rust appearing in certain spots rather than across the entire skillet, worn seasoning could be the problem. Seasoning is the protective layer that forms when oil is heated on cast iron. It helps prevent rust, makes the cooking surface easier to maintain, and improves food release. Over time, however, seasoning can wear down. Cooking acidic foods, scrubbing too aggressively, or simply using your skillet regularly can gradually affect the protective layer. When the seasoning wears away, the exposed iron becomes more vulnerable to moisture and rust. Keep an eye on your skillet's cooking surface. If you notice dull, dry, or uneven patches, it may be time to reseason it.
How to Reseason a Cast Iron Skillet:
- Start by cleaning the pan with warm water and Caron & Doucet Cast Iron Soap, using a Caron & Doucet Cast Iron Scrub to remove stubborn food or rust.
- Dry it completely, apply a thin layer of Caron & Doucet Cast Iron Oil, wipe away any excess.
- Bake it according to your cookware manufacturer's instructions.
For regular maintenance, cast iron oil can help maintain your skillet's protective layer between reseasoning sessions.
3. Leaving Your Cast Iron Skillet to Soak in Water
After a big meal, the last thing you probably want to do is wash a greasy skillet. It's tempting to leave it in the sink and deal with it later. But leaving cast iron to soak is one of the easiest ways to end up with rust. Unlike stainless steel, cast iron doesn't handle prolonged exposure to water very well. Even a well-seasoned skillet can develop rust if it's left sitting in water for too long.
How to Remove Rust When You’ve Soaked Your Cast Iron Skillet in Water
You don't have to wash your skillet the second you finish cooking, but don't leave it soaking overnight. Once the pan has cooled enough to handle safely, remove any leftover food and grease. Wash it with warm water and a cast iron soap, then dry it thoroughly. For stubborn, stuck-on food, use a cast iron scrub to help loosen the food residue without having to leave your skillet sitting in water.
And yes, you can use soap on cast iron! A common misconception is that soap will ruin the seasoning. In reality, a soap designed specifically for cast iron skillets, is milder than dish soap and won’t strip the seasoning of the cast iron skillet.
4. Applying Too Much Oil to Your Cast Iron Skillet
When it comes to seasoning cast iron, more oil doesn't necessarily mean better protection. Applying too much oil can leave your skillet with a sticky, uneven surface. Instead of forming a smooth layer, excess oil can build up and make the pan unpleasant to cook with. While too much oil doesn't directly cause rust, a poorly maintained seasoning layer can leave your skillet more vulnerable to moisture.
How Much Oil Should You Use on Cast Iron
The trick is to use less oil than you think you need. After cleaning and drying your skillet, apply a small amount of cast iron oil, about 1/8 to 1/2 teaspoon of oil for a standard cast-iron skillet. Using a paper towel or clean cloth, spread it evenly across the cooking surface, sides, bottom and handle. Then, use a clean paper towel to wipe away any excess. Your skillet should have a slight sheen, not a greasy coating. A dedicated cast iron oil makes it easy to maintain your skillet. Just remember that a thin, even layer is all you need.
5. Storing Your Cast Iron Skillet in a Damp Place
You can do everything right when cleaning your skillet and still end up with rust if you're not storing it properly. Humidity is one of cast iron's biggest enemies. If your skillet is kept in a damp cupboard or stored somewhere with poor airflow, moisture can accumulate on the surface and cause rust. This is especially common when storing cast iron for long periods, such as over the winter.
How to Store Cast Iron to Prevent Rust
Before putting your skillet away, make sure it's completely dry. If you're not planning to use it for a while, consider applying a very thin layer of cast iron oil to protect the surface. If you stack your skillets, place a paper towel between them to absorb any residual moisture and prevent scratches. It's also a good idea to avoid storing your skillet with its lid tightly in place. Allowing some airflow can help prevent moisture from becoming trapped inside.
Cast Iron Rust: Frequently Asked Questions
1. Why Does My Cast Iron Skillet Keep Rusting After Washing?
Your cast iron skillet may keep rusting after washing because moisture remains on the surface. Even a small amount of water can cause rust, especially if the seasoning is damaged. Dry your skillet thoroughly with a towel and briefly heat it on the stovetop to remove any remaining moisture.
2. Can I Still Use My Cast Iron Skillet If It Has Rust?
Yes, in most cases, a cast iron skillet with light surface rust can be restored and used again. Scrub away the rust, wash the skillet, dry it thoroughly, and reseason it with cast iron oil.
3. How Do I Remove Rust from a Cast Iron Skillet?
To remove rust, scrub the affected areas with an appropriate scrubber, for stuck on food residue, use a cast iron scrub. Wash the skillet with warm water and cast iron soap, dry it completely, and apply a thin layer of cast iron oil. If the rust has damaged the seasoning, reseason the skillet before cooking with it again.
4. Does Seasoning Prevent Cast Iron from Rusting?
Yes. Seasoning creates a protective layer that helps prevent moisture from reaching the iron. However, seasoning isn't permanent or completely waterproof. Regular cleaning, thorough drying, and occasional reseasoning help maintain that protection.
5. How Often Should I Oil My Cast Iron Skillet?
You don't necessarily need to oil your skillet after every use. If the seasoning is in good condition, regular cooking and proper cleaning may be enough. However, applying a very thin layer of oil after washing can provide additional protection, especially if you're storing your skillet for an extended period.
6. Can I Use Soap to Clean a Rusty Cast Iron Skillet?
Yes. A soap formulated for cast iron, is mild enough to help remove grease and residue after you've scrubbed away the rust. However, soap alone won't remove rust. You'll need to scrub the affected areas and may need to reseason the skillet afterward.
Cast iron is known for lasting a long time, but it does need a little attention. Fortunately, keeping rust away doesn't require a complicated cleaning routine. Don't leave your skillet soaking in water, dry it thoroughly after washing, and keep an eye on the seasoning. A little regular maintenance can go a long way toward keeping your cookware in good condition.
If your skillet needs a little extra care, Caron & Doucet Cast Iron Soap, Cast Iron Scrub and Cast Iron Oil can help you clean and maintain it as part of your regular routine. With the right care, you can spend less time worrying about rust and more time enjoying your favorite meals!
