What he said.No it's sacrifice a goat ON the cast iron you are trying to season... May need two or three darks of the moon,..
I like preheat, very thin rub with flax seed oil and bake for an hour to cure. Turn oven off and cool slow until room temperature. Repeat until you're happy.t
My experience exactly. I own all manner of cast iron, modern & vintage. Have done quite a few restores, using lye and electrolysis. I have stripped and seasoned many cast iron skillets. I have used organic cold pressed flax seed oil many times. It is a high smoke point oil and polymerizes easily. Have never seen flaking.
However, my experiences using flax oil doesn't leave the skillets with that deep, dark, patina that I like to see. Vegetable and lard does, but these low smoke point oils do not have the polymerization power that high smoke point oils like Canola and Flax do.
Here lately, I have actually been mixing in thirds, flax, canola and vegetable together, seasoning cast iron with very thin layers, on about 475 degrees. Heating for an hour and letting the cast iron cool with the oven. Then repeating at least 6 times. I like the results I have been getting.
Here is a 12" Griswold slant made around 1906, re-seasoned with this mixture.
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You have to start by sacrificing a goat during the dark of the moon.