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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.

If you have the time and the budget, we strongly recommend staining your fence, especially if it's looking a bit tired or hasn't been treated recently. While you may not see the same return on investment (ROI) as you would with a project like a kitchen remodel, staining a fence is one of the best ways to add a facelift to your property—a new fence stain adds serious curb appeal to your home. 

Maintaining a composite fence is pretty straightforward, as it doesn’t require staining or repainting. To keep it clean, scrub the fencing with a composite deck cleaner or hot, soapy water. Use a soft-bristle brush for the best results, and avoid using pressure washers or sanders. Plan to clean your fence at least twice a year. Scrubbing the fencing in the fall and spring can help prevent mold and mildew growth.

Wood stains last anywhere from two to five years, depending on exposure to the elements, your local climate, the type of stain, and the surface it’s on. For instance, vertical surfaces last longer than horizontal surfaces. Some types of woods, like dense hardwoods, will require a recoat yearly, as they are too dense for the stain to absorb. In any event, apply a recoat every 2 to 4 years. As for storage, a can of unopened stain can last up to 5 years, though results may vary.