Preserva-Wood is a unique product in that it is intended for use in restoring weathered wood and not just preserving it (which it does also). This is a totally organic formula, which uses no acids, corrosives or bleach. The unique blend of resin and oil penetrates wood cell structure, restoring the cells and restoring the surface of the wood. Once treated wood returns to looking new again. Since it penetrates the cells, it doesnt leave anything on the surface to peel or chip. The finish resists, mold, mildew and algae, as well as splitting and warping.