This article has a good explanation of why flax oil might be one of the
better oils to use to season cast iron:

http://sherylcanter.com/wordpress/20...ing-cast-iron/

I tried it for the first time today, and I'm getting a "mottling" effect on
the bottom of the pan. There are some spotty sections where it looks like
the oil is glossy instead of matte. Maybe the oil did not burn off
entirely, but the pan did stop smoking. How do I get a nice even matte
finish?

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W