Apply a thin, even layer of wood sealant (either silicone based or polyurethane) using a paint Power Sprayer.
Products that specialize in waterproofing wood come in many varieties, including clear or tinted. Many of the clear types showcase the wood’s natural beauty, but both kinds allow the wood to gray naturally as it ages. Tints include natural wood shades and a large range of other colors, though most are subtle and quite translucent.
There is an increasing interest in nontoxic waterproofing solutions. These are better for the environment, and will not poison nearby plants or animals. While they may be difficult to find and do not usually last as long as regular wood sealers, they are low-odor and generally safer than other types.
Most wood sealants are made of epoxies or similar polymers. Some people choose to make their own product that works for waterproofing wood. Typical ingredients of homemade wood sealants include acetone, polyester resin, and tung oil, to name a few.
Determining if wood needs to be waterproofed is simple. Clearly, if it is a new fence or deck that has never been in contact with wood sealants, it is a good idea to apply some. If the wood structure has been waterproofed in the past, splashing water on the wood can help determine whether to apply more solution. If the water beads up when it hits the wood, the material is still protected and does not need another application.