Okay. I am going to begin building our raised beds this year. I'm going to use kiln dried pine 1x12 stacked 2 high. I plan to cut everything to the size I need, char it heavily, and then soak it in some type of oil. The reason I want to do this is so I don't use pressure treated wood around things I intend to eat.

My question is this, what is the cheapest oil in large quantities that would absorb readily and help the wood resist rotting? So far mineral oil and linseed oil are what I have come up with. But I have no idea as to which one would be better or cheaper in large amounts.

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