How to Waterproof Wood Posts
Waterproofing a wood post slows the post's absorption of moisture. A waterproof wood sealant can also improve the appearance of the wood post by adding shine and color. "By reducing the periodic wetting of wood, water-repellent coatings can reduce the swell-and-shrink cycles that contribute to the checking and weathering of exposed wood such as decking boards," according to Adam Taylor, assistant professor of forestry, wildlife and fisheries at the University of Tennessee. Waterproof wood sealants can be purchased at local hardware stores.