Having primed the wood, and having allowed sufficient time for the primer to dry (it should take no more than a day), move on to applying your top coats. When repainting pressure-treated wood, old paint needs to be scraped away first and it’s a job that can be rather labor intensive. Though sealant must also be reapplied every few years, it’s an easier process than repainting. Yet another option is to coat pressure-treated wood with a protective sealant as soon as it is dry, or once it has weathered to the desired shade. On the downside, painting takes a little longer to do than staining and will likely need more frequent reapplications, typically every 2 to 3 years. There’s also the fact that paints come in more color options than stain colors for pressure-treated wood. One of the advantages to painting pressure-treated wood rather than staining it is that paint provides better coverage, which is ideal if you’re covering wood that has seen better days. Some experts recommend staining over painting this type of lumber because paint might not adhere as well, while stain can soak deeper into the lumber. Semi-transparent stains such as Defy Extreme Wood Stain, the top stain for pressure-treated wood in our guide to the best deck stains, look more natural than opaque paints because the wood grain shows through the stain. Pressure-treated wood also can accept staining. Water-based pressure-treated woods should be safe for garden beds, with a few precautions. Pressure-treated wood most often is used for decks, fences, and other outdoor structures. When you shop for pressure-treated wood, be sure to check the tag on the product for specifics: The tag should note whether the lumber is for above-ground or ground contact use, the type of preservative the wood contains, and its retention level (the higher it is, the better its rot resistance). Common oil-based preservatives include creosote or pentachlorophenol and are not registered for home use. Typical water-based preservatives include copper compounds, which combine the element with fungicides or decay-preventing chemicals. What is pressure-treated wood treated with? Manufacturers can imbue the wood with chemicals in either a water- or oil-based solution. Ground-contact pressure-treated wood is cured with more chemicals and is thus appropriate for use just above the ground, at ground level, or wherever ventilation is poor. There are two main types of pressure-treated lumber: Above-ground products only work when they’re used at least 6 inches above the ground and where the material has proper ventilation and drainage. Some lumbers, such as cedar, are not great candidates for pressure treating because they already resist rot and decay. Softwoods, most often southern yellow pine, take to the process better. Manufacturers force water and preservative chemicals into the wood, into the space left by removing air in a special depressurized holding tank. Pressure-treated wood is natural milled lumber that is treated to better fight rot and decay.
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