Water-base paint is a type of paint that uses water as its main solvent instead of oil or other solvents. The term 'water-base paint' is often used interchangeably with the term 'latex paint, ' which is a type of paint that uses synthetic polymers such as acrylics, vinyls, and styrenes as binders. One type of water-base paint is casein paint, which is made from a protein found in milk and has been used for centuries as a binder in paints. Casein paint is known for its durability and resistance to fading, making it a popular choice for interior and exterior painting projects.