Caulking is a process of sealing gaps and joints between two surfaces, typically using a flexible material such as silicone, polyurethane, or latex. It is commonly used in construction, woodworking, and plumbing to prevent air, water, or dust from entering or exiting a building or structure.

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Caulk is applied in a continuous bead along the joint or gap using a caulking gun or other application tool. It is then smoothed out with a tool or finger to create a tight seal between the two surfaces. Once the caulk has dried or cured, it forms a flexible, durable barrier that helps to prevent moisture, drafts, and other elements from penetrating the joint.

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Caulking is commonly used to seal gaps and joints around doors, windows, pipes, and other openings in a building or structure. It is also used in tile work and other home improvement projects to fill gaps and joints between materials.

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Properly applied caulk can provide a number of benefits, including improved energy efficiency, reduced drafts, improved indoor air quality, and protection against moisture and water damage. It is important to select the appropriate type of caulk for the specific application and to properly prepare the surfaces to be caulked for optimal adhesion and performance.