Restoring a Rusted Cast Iron Pan
A neglected pan often looks ruined, but the metal itself is usually sound. Strip it back to the base, rebuild the seasoning from scratch, and it will return to service as if it were brand new.
Commit to the full process
Once you remove the rust, the pan is vulnerable to flash-rusting within minutes. You must have your oil and oven ready to go the moment the scrubbing is finished.
- steel wool or stainless steel scrubbie
- coarse salt
- paper towels
- grapeseed or flaxseed oil
- oven
What goes in.
- 2 tbspcoarse kosher salt
- 1 tbsphigh-smoke-point oil (grapeseed, canola, or sunflower)
Wipe it like you made a mistake
When applying oil for seasoning, you want the thinnest possible layer. Wipe the pan with oil, then use a fresh paper towel to wipe it off as if you are trying to remove every trace; the microscopic residue left behind is exactly what you need to form a hard, non-stick surface.
The method.
Scrub the rust
Use steel wool to scour the rusted areas until the orange flaking is replaced by raw, dull grey iron. If the rust is stubborn, create a paste with coarse salt and a drop of water, then scrub with a folded paper towel or a stiff brush.
Clean and dry
Wash the pan with hot water and a small amount of soap to remove the metal dust. Dry it immediately with a towel, then place it on the stove over low heat for three minutes to ensure every pore is bone dry.
Apply the first coat
While the pan is still warm, apply a tiny amount of oil. Use a paper towel to buff it into every surface, including the handle and underside, then wipe until the pan looks matte.
Bake the seasoning
Place the pan upside down in a 450°F oven for one hour. Turn off the oven and let the pan cool completely inside to allow the polymer layer to set.
When it doesn't go to plan.
If your pan has deep pitting, the seasoning will take longer to smooth out; just keep cooking fatty foods in it.
Never soak a cast iron pan in water, even after it is restored, as this invites the rust to return.
The smoke point of your oil matters; stay away from olive oil or butter as they will burn and turn sticky rather than hardening into a proper layer.
The ones that keep coming up.
How do I know if the rust is too deep?
If the pan has holes that go all the way through, or if it is warped from extreme heat, it is time to retire the piece.
Does my pan need to be black after the first round?
No. The deep black color comes from years of use. A freshly restored pan will be a dull, light grey or bronze color until it builds up layers over time.
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