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Deck Staining questions, answered by experts

Yes, staining or sealing a cedar deck or fence is highly recommended to extend its lifespan, typically by five to 10 years. While cedar is naturally resistant to mold and mildew, it can still fall victim to moisture, sun exposure, and rot over time. Applying a treatment creates a protective shield that helps prevent splintering, fading, and decay, preserving the wood's strength and appearance. A combination stain and sealer often provides the best protection, as it soaks into the wood grain rather than just sitting on top. This offers superior defense against UV damage and rot and lasts longer than a sealer alone. To maintain the wood's natural look, consider using a near-translucent stain. You should plan to reapply the stain or sealer every two to three years.

In most cases, sanding an old deck before staining it is necessary to achieve a decent finish. If your old deck has a relatively new stain finish on it and you're only doing touch-ups, you can generally skip the sanding part. However, if your goal is to make the deck look and function better, sanding first is a must. 

The best time to paint your deck is when temperatures are neither too cold (below 60 degrees) nor too hot (above 85 degrees). Always paint your deck when there’s no risk of rain. For fast-drying paint like acrylic or latex, ensure your deck can dry for at least four hours. Oil-based paints take longer to dry and may require 48 hours to completely cure.

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.

Stain is meant to be absorbed by the porous wood, allowing some of the natural grain to show through. With that in mind, you don’t want to add more stain than the wood can absorb, as you risk covering up its natural markings. Generally, two coats is the maximum you should do, although very dense hardwoods may only be able to take a single coat.