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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.

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.

Wood stain remover should remove most, if not all, of that wood stain on its own. While sanding can be a great final step, especially if you’re planning to paint or restrain the wood, it isn’t always required. Following the first three steps of this process can leave you with beautiful results. 

If your couch is damaged, you are not out of options. You might try fixing it on your own, bring in a furniture repair specialist, or opt to get rid of it responsibly. Depending on its condition, you could donate, sell, recycle, or drop it off at a local scrap facility.