A water-based primer made for cementitious surfaces is called a water-thinnable cement primer. It is simple to combine and dilute with water, making application convenient. By penetrating the substrate, the primer seals the surface and improves paint adhesion. Better coverage and a lower chance of peeling or flaking are ensured by plugging pores and reducing paint absorption. Concrete, plaster, and masonry surfaces can be treated with water-thinnable cement primer for both indoor and outdoor uses. It is an environmentally beneficial option thanks to its water-based formulation, which makes cleanup simple. Overall, using this primer to prepare cement surfaces for painting is a practical and affordable approach.