Wood sealers are protective coatings applied to wooden surfaces to prevent moisture, dirt, and other contaminants from penetrating the wood. They help to preserve the wood's natural beauty and extend its lifespan by reducing the risk of warping, cracking, and decay. Sealers can be used on various wood types, including hardwood, softwood, and composite materials. There are different types of wood sealers, including oil-based, water-based, and polyurethane options. Each type has its own advantages, such as ease of application, drying time, and durability. Choosing the right sealer depends on the specific project and the desired finish for the wood surface.