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You should wait three to six months after you buy it to paint pressure-treated wood. It needs time to dry from the chemicals applied to it. The paint will not adhere to the treated wood as well if it’s still wet from chemicals. To test the wooden boards, drip water onto them. If the wood absorbs the water, it’s ready for painting. If the water beads up, it’s not dry enough to paint yet. You can build your deck or fence while the treated wood is still wet, but you’ll need to paint it later.

When staining a deck, don’t skip surface prep, avoid staining damp or dirty boards, and don’t apply stain in extreme heat, cold, or wet conditions. Never overload the wood with a stain, as too much can cause tackiness or peeling. Also, don’t forget to test a small area first to ensure the color and finish look right.

Many decking oils can help slow down algae growth, but they don't completely stop it. These oils work by sealing the wood, which reduces moisture and, therefore, algae growth. Some decking oils also help protect against UV damage, but they need to be reapplied according to the manufacturer’s instructions to ensure the decking stays protected.

You’ll need to restrain your deck when you notice fading, cracking, peeling, or mold and mildew over a moderate to large area, or when it’s become especially difficult to clean. As for how often to stain a deck, plan to do it every two to three years or whenever you start to notice extended damage.