Reducing wood movement with polyurethane?
I'm making some tables out of regular 2x's of Doug Fir. I am very aware of wood movement and having the proper joints to allow for the wood to move etc. What I'm wondering is, if I were to polyurethane all faces of the table top (top, bottom, sides, ends) will that reduce or eliminate any potential wood movement through the seasons? I'm wondering if doing that will "lock in" whatever moisture is in the wood and then throughout the seasons, no matter how humid or dry it is, the moisture content will remain the same or relatively close to what it was when built. Even if this will reduce wood movement by just a fraction I feel like this would be very beneficial to preventing any cracks or separations.