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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.

Regular staining, sealing, and inspecting for rot or insect damage prolongs fence lifespan.

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.

Yes, you can and should paint or stain pressure-treated wood to help prevent the boards from cracking. However, you must wait for the wood to dry out completely before applying any finish. Freshly treated wood can take weeks or even months to dry; a common recommendation is to wait three to six months. To check if the wood is ready, perform a simple water test: drip some water onto the surface. If the water beads up, the wood is still too wet and needs more time to dry. If the wood absorbs the water, it is dry enough to be painted or stained. You can proceed with building your deck or fence while the wood is still wet, but you will need to wait to apply the paint or stain.