JohnM, It all sound very interesting. But why not use pressure in and vaccuum out. Pressure treating gets preservative almost to the center of a yellow pine 6 x 6 if done well. However every solution may present an unintended consequence. Let's say we can get every cell and vescicle and bit of xylem and phloem of our cellulose sponge coated with a bit of our impervious finish of choice. Then we go hunting. And we fall and dent our masterpiece. How the hell do we steam that dent out now? I only ask this to keep those brain cells churning. They say it prevents Altzheimers you know.