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Re:Chemistry of Cast-Iron Seasoning (2010) by ethbr0 on Sunday January 10, 2021 @03:10PM (#25719104)
"Soak into" is probably an engineering approximation converted to lay language.

What we're really talking about is surface-gap-filling.

So yes, "into" at some level of magnification. "Onto" at another.

Re:Chemistry of Cast-Iron Seasoning (2010) by BikiniPrince on Sunday January 10, 2021 @03:31PM (#25719348)
Indeed! I was avoiding describing the surfaces at high detail .