A watertight coating is a type of SEALANT that is used to protect surfaces from water damage. It is typically applied as a liquid or paste and then allowed to dry, forming a protective barrier against moisture. The most common types of watertight coatings are acrylics, silicones, and polyurethanes. These coatings are often used in construction, automotive, and marine applications to protect against corrosion and other forms of water damage.