Waterproofing wood can be performed by anyone with a basic knowledge of wood sealants. Though some people hire professionals for large jobs, most simply buy a bucket of waterproofing solution to apply to their exterior wood. Others choose to create their own solution. The best method is the one that is most convenient for the person doing the work.

It is crucial to waterproof wood to protect it from rotting, warping, and cracking. Without a waterproofing membrane, the wood will soak up water, and as it dries, it will contract. This cycle of expanding and contracting each time it gets wet and then dries can cause it to crack or warp. Additionally, water often washes the color out of certain woods. Mold, algae, and mildew may also cause problems.

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.

Waterproofing wood is typically simple, as the range of products include those that can be brushed on with a paintbrush or even sprayed on with a garden sprayer. The number of applications depends on the hardness of the wood. Softer woods like cedar will soak up more product, so two or three applications might be necessary. Harder woods can often get by with just one coat, although it is important to read the instructions of the selected product and use it as directed.