Restoring Rusted Cast Iron
Rust is not a death sentence for cast iron. It is simply an oxidized layer that sits on top of the metal, waiting to be scrubbed away so you can reset the surface.
Patience is your primary tool
Do not rush the final oven cycle, as this is where the metal actually accepts the oil. Ensure your space is well-ventilated during the heating process.
- Stiff stainless steel wire brush or scouring pad
- Steel wool (grade 0000)
- Lint-free cotton cloth
- Oven-safe pan
- Grapeseed or flaxseed oil
The polymerization process
Heating the oil past its smoke point transforms it from a liquid into a hard, plastic-like barrier that bonds to the iron. If the layer of oil is too thick, it will become gummy and sticky rather than slick.
The method.
Scrub the rust
Use a stainless steel brush to mechanically remove the loose rust. Apply force; you need to reach the bare grey metal underneath the orange corrosion.
Wash and dry
Wash the pan with hot water and a small amount of soap. Dry it immediately with a towel, then place it on a burner over medium heat for three minutes to evaporate every trace of moisture.
Apply the oil
While the pan is warm, apply a half-teaspoon of oil. Rub it over the entire surface, then use a fresh cloth to wipe it off as if you made a mistake and are trying to remove it all. You want only a microscopic film.
Bake
Place the pan upside down in a 450°F oven for one hour. Turn off the oven and leave the pan inside until it is completely cool to the touch.
When it doesn't go to plan.
If rust persists in deep pits, repeat the scrubbing phase before seasoning.
If the surface looks patchy after one bake, repeat the oil-and-bake cycle two more times.
Never let the pan air dry after washing; always use heat to force the moisture out.
The ones that keep coming up.
Can I use vinegar to remove the rust?
Vinegar works by dissolving the rust, but it is acidic and can pit the metal if left too long. Scrubbing is safer for the integrity of the iron.
Why is my pan sticky after seasoning?
You used too much oil. To fix it, wipe it with a clean cloth and bake it again for another hour.
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