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I've tried to use air-dried wood several times here in Mississippi where our relative humidity hovers around 60%. Had bad results every time. I just won't invest my time in anything that hasn't been kiln-dried except for outdoor furniture.Never ever considered walnut to be trash wood. Well, I found some.
My project, a rifle case, requires several different widths (1", 1 1/4", 1 3/4", and 2") of 5/8 thick walnut. Each 42" long. To be sandwiched between 1/8" strips of maple.
Pulled a couple boards from a stack that's been stickered in a closed shed for 12 years. Mind you, this is AZ where the humidity is near nothing.
Got enough of it rough cut to length, planed to thickness and ripped jointed to width. Several hours of labor.
Laid them out on the assembly bench to arrange the pattern and left them overnight. The next morning, Monday of course, every one of the walnut pieces had bowed. Some by as much as 1/4".