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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.

Wood can appear blotchy after staining due to uneven absorption, which happens when the wood has varying grain density. The denser the grain, the less the stain will be absorbed. This can cause the wood to appear uneven in color, with some areas darker than others. 

To prevent this issue, apply a wood conditioner before staining. Wood conditioners help to equalize the absorption of the stain, resulting in a more even finish. There are many different types of wood conditioners available, so be sure to choose one that is appropriate for the type of wood you are staining.

In some cases, a simple clean, polish, and wax can make antique wood furniture look brand-new. However, always be sure to check the type and state of the current finish. Some furniture will require professional care, a new coat of finish, or even a new layer of stain to look like new.

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.