Though the lifespan of a good water seal can vary between brands, most products that provide a water seal to your outdoor wooden structures will last between five and ten years. For example, the water seal created on wood surfaces by the Thompson’s brand of wood sealer that was discussed previously will often last for ten years of waterproofing protection. Shopping for wood sealers that offer the longest protection is an important way to reduce unnecessary yard maintenance and ensure that your furniture, fencing, and other structures last for as long as possible!