DEFINITION: Re-caulking is the process of removing old and worn-out caulking from the joints and seams between two surfaces, such as around a bathtub or shower, and replacing it with new caulking. Caulk is a flexible, waterproof material that is used to seal joints and seams between two surfaces, preventing moisture from penetrating and causing damage. Over time, caulking can become brittle, cracked, or discolored, which can detract from the appearance of the area and may allow water to seep in, potentially causing damage to the surrounding surfaces.