Cap the Drilled Hole

years. And they're surprisingly cheap. For just $88, you can protect 24 4x4 fence posts, which could end up saving you thousands over the life of an entire fence. All it takes is drilling a hole, inserting the preservative stick, and capping it off. It'll dissolve and disperse when moisture content exists that supports decay, protecting the post for up to 10 years from a single treatment. And you can easily reload and extend their lifespan even further with the same hole. They work on any shape, size, species, and age of wood. And we