When you season your cast iron, the oil on the skillet undergoes a process called polymerization. Applying too much oil prevents proper polymerization, leaving your cast iron streaky, sticky, bubbly, and tacky. Always wipe off the excess oil(leaving a very thin layer) before putting it in the oven.
It's from too much oil during seasoning. You want to buff the pan to the point of it being completely dry after applying oil. Basically, put oil on it and then try and remove as much as you can. That's a sense for how much you should leave behind.
After enough layers of seasoning have been applied, what you end up with is not a greasy coating but a hard, blackened skin that protects the metal. Fortunately for us cooks, it also has nonstick properties that make even the most stick-prone foods (think: fried eggs) a pleasure when using cast iron.
If you put too much on on it then you can end up with soupy patches of seasoning as opposed to a solid thin layer of seasoning being built on itself over and over.
Seasoning your skillet in the oven can create these thick layers that are prone to flaking, which is why we don't typically recommend it. Sometimes flaking seasoning can just be caused by cooking the wrong thing, like an acidic sauce or a salty broth.
Bake your cookware upside down at 450 degrees Fahrenheit in the oven for one hour. Allow the pan to cool down completely, and repeat three more times.
Using flaxseed oil to season cast iron pans is a growing trend. Flaxseed oil has a very low smoke point—at just 225 degrees F—which means it's quick to polymerize into a layer of seasoning.
Clean your cast-iron skillet each time you use it. Doing so prevents stuck-on food from staying on the skillet between uses. If the skillet is only slightly dirty, a quick wipe after cooking in it will work. If dirtier, or food is stuck, then scrubbing it is best.
Bake upside down in the oven at 350 degrees F for 1 hour (line the rack below with foil to catch any oil drips). This will protect the surface and give it an almost nonstick quality. Some people tout another seasoning method: heating the pan on the stove.
This layer is known as the patina and offers cookware a dark and glossy finish. The patina will only improve over subsequent uses as additional fat and oils are heated into the pan. Beyond its natural look, this layer is an essential part to any cast iron cookware, providing a stick-resistant surface.
Stainless steel pans are known for their smooth surfaces, which can make them easier to work with when cooking delicate items like eggs or fish. They are also less prone to sticking than cast iron pans, which can make them a better choice for tasks like sautéing or frying.
When you season your cast iron, the oil on the skillet undergoes a process called polymerization. Applying too much oil prevents proper polymerization, leaving your cast iron streaky, sticky, bubbly, and tacky.
Vintage cast iron skillets were tumbled for a long time, in order to remove sand from the mold and make the surface of the skillets super smooth. These days, that step is skipped so that some of the sand remains, making the surface rough.
Oil, especially canola oil (bad, unhealthy oil), should not be used. If a quick oiling (not seasoning) in between is desired, it's best to use a high temperature oil like avocado. A quick rub can do the trick, if your pan looks a bit dry. I have one pan that is about 100 years old!
Best High Smoke Point Oils
Refined Avocado Oil - The smoke point of refined avocado oil is between 480 to 520 degrees Fahrenheit. Canola Oil - All canola oil is refined and has a smoke point between 400 and 475 degrees Fahrenheit. Grapeseed Oil - Grapeseed oil has a high smoke point of 420 degrees Fahrenheit.
You should only need to fully re-season your cast-iron cookware one to two times a year, but you may also want to give it some extra seasoning love anytime you cook something that requires a heavy-duty cleaning.
With proper care cast iron cookware can withstand a lifetime of use. Actually several lifetimes as these cast iron pans and dutch ovens are often passed down from generation to generation. Taking care of cast iron cookware is as easy as 1 – 2 – 3.
Visually, a well-seasoned cast iron will have a slight sheen, and one that is ready for reasoning will look dull and matte. A pan that needs seasoning is, essentially, thirsty — the metal needs conditioning. It's more likely to hold onto surface oils after cooking, giving the illusion that the seasoning is intact.
You can't over-season cast iron so season as often as you'd like, but don't go crazy thinking you need to season your cast iron every Sunday. Clean and maintain your cast iron properly and your cast iron will continue to look and perform fantastic.
A cast-iron skillet can withstand heats of up to 1500°F, which is much hotter than your oven could ever be. The seasoning will only burn off at about 800°F, so don't worry that you will damage your pan by cooking with high heat.
You can also season your cast iron cookware in the oven. This method adds a more thorough layer of seasoning onto the entire pan, strengthening the bond to the iron. It can be beneficial to season your cast iron in the oven a few times a year. We recommend oven-seasoning when restoring a rusty cast iron pan.