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Staining or sealing a cedar deck or fence is highly recommended to extend its lifespan and protect it from the elements. While cedar is naturally resistant to mold and mildew, it is not impervious to damage from moisture, sun exposure, splintering, fading, and rot over time. Applying a protective finish creates a shield that preserves the wood's strength and appearance, potentially extending its life by five to 10 years.

When choosing a finish, it's helpful to understand the difference between a sealer and a stain. A sealer sits on top of the wood, whereas a combination stain and sealer soaks into the top layer. Because it penetrates the wood, a stain generally offers better protection against UV damage and rot and lasts significantly longer. For the best results that also preserve the wood's natural color, consider using a near-translucent stain.

To maintain protection, plan on reapplying the stain or sealer every two to three years, either as a DIY project or by hiring a professional.

Your tool of choice ultimately comes down to personal preference. Many DIYers prefer applying stain with a lint-free rag, but others stick with a paint brush or a roller. Wipe the stain and work it into the wood, working with and against the grain. If you’re applying multiple coats, allow the stain to dry for around four hours between coats.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.

Typically, a fence requires one to two coats of stain. The exact number can vary depending on the porosity of the wood. For specific guidance, it's best to check the manufacturer's instructions. After applying the first coat and letting it dry completely, you can assess the finish. If it appears patchy, uneven, or you want a more saturated color, a second coat is recommended. An extra coat can also help cover lap marks.