[header] How to seal and stain pressure treated wood decking [title] Remove staining, mildew and old finish with a commercial deck cleaning solution. [step] Pressure washing is almost always a must on older decks, but be sure not to use too much pressure. You can damage the wood if it's turned up too high. <sep> (A) [title] Scrape away old finish with a rake. [step] You can add wood putty to the first few inches of wood to make it easier to remove old finish. (B) A continuous stream of water, or a powerful jet air stream, will blot away too much staining or warping. [substeps] If you have a full deck, wet a cloth and wipe down the entire area thoroughly. (C) Similarly, you can rust the wood by using too much grease. [substeps] Once the stain has dried to the level of rust on all sides, scrape the stain with a deck scraper, tenderizer, or similar tool until it is off. (D) Usually 1500-2500 psi is adequate for pressure treated lumber. Stay between 1200-1500 psi for cedar and redwood.
D