Generally, a recently installed pressure treated deck or fence can be stained or sealed after 4 weeks. If heavy precipitation is incurred immediately following installation of your deck or fence, we recommend waiting an additional 2 weeks to allow the wood to properly cure. Equally, if the wood came from the lumber yard and was very green we also recommend waiting an additional 2 weeks. The visible Green coloration in the wood is the chemical used to pressure treat the wood during the manufacturing process.