One-component anti-corrosive primer with a water-based formulation is designed for application on both old and new metallic surfaces. It serves as an ideal protective layer against corrosion on iron or steel surfaces, exhibiting robust adhesion to metallic substrates. The primer is particularly well-suited for use in both interior and exterior areas, providing resilience against adverse weather conditions and industrial atmospheres. Its versatility extends to applications in seaside areas, making it suitable for surfaces that will subsequently be covered with water-based waterproofing coatings such as Neoproof PU W, Neoroof, Revinex Elastic, among others.