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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.

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.

You shouldn't paint a metal fence. Painting doesn't necessarily damage a corrugated metal fence, but these types of fences are meant to flex, and paint can easily chip and break off. Latex paints can address this issue, but those tend not to be very weather-resistant. Certain paints can trap moisture in the corrugation, which can rust the metal and lead to corrosion. And finally, if you paint a copper fence, it won't patina, which is one of the main reasons people buy copper.  

Wood stain does go bad, but it will last in the can for between three and six years, provided you use proper storage techniques. Storing wood stain in open containers or in extremely low or high temperatures will cause your wood stain to become unusable much more quickly. Water- and latex-based wood stains typically last for just two to four years, while oil-based wood stains can last for three to six years.