Please keep in mind that Rust-Oleum Restore 10x Advanced Deck and Concrete Resurfacer is not considered a waterproofing or sealer coating. The aggregate in the coating, combined with the acrylic resin, makes it very permeable which would allow moisture to pass through the film. This means that while the wood will absorb the moisture, the coating will also allow it to release from the wood. The Restore will not cause a wood surface to rot; however, it will not be capable of stopping any rot that exists in the wood when the coating is applied. It also will not prevent rotting as related to structural abnormalities in the decking such as lack of drainage, poor airflow, etc.