For most outdoor wooden projects, you can stop rot from occurring by preventing the spread of moisture through the wood and into the joints of the structure. And a great way to protect against moisture in any outdoor wooden structure is with a proper sealer that repels water and guards the wood itself against any warping or cracking that might let in even a small amount of moisture. From furniture to windowsills, fences to gazebos, you can prevent wood rot in your external fixtures by applying an outdoor wood sealer. From furniture to windowsills, fences to gazebos, wood sealer can also be used successfully in combination with caulking or weatherstripping. This practice is particularly effective on sheds or the outside of your house. The combination of outdoor sealer and caulking will help prevent water from seeping into the joints of the structure, while the sealer safeguards the wood surfaces themselves, fully preventing wood rot from taking place.