Designed for use above and below ground and below the water line. Copper-Green Wood Preservative shields wooden surfaces from the elements, mold, mildew, rot, fungi, decay and wood-eating insects. The heavy-duty, solvent-based preservative protects new wood and highlights the weathering process, and prevents future damage for old wood. The copper in Copper-Green reacts with the cellulose of wood. As a result it is not easily leached from the wood and extends the service life of the wood product. One gallon can be used to cover an area from 150 to 200 Sq. Ft. per Gal. for brush coat or 5 to 10 Gal. per 100 board feet for dimensional lumber.