How do I extend the life of Preschem’s preservative systems?

Remove the source of moisture. Moisture will degrade timber and the Preschem preservative system applied over time. If the source of moisture is removed, then Preschem products will remain in the timber almost indefinitely waiting to protect the timber when moisture becomes an issue again. Sealing the timber with a quality paint is the simplest and most effective means of controlling moisture in timber when its above ground.