<p>Corrosion of metal reinforcements in cement structures is the main reason for an increase in the maintenance expenses of such structures. It is found, generally, in the case of harsh environments, such as coastal areas, where chloride-induced corrosion is the main cause of steel reinforcements. The research explores the performance of the polyurethane coatings that are modified with barite, fly ash, and bentonite fillers mixed with different ratios (20%, 40%, 60%, 80%, and 100% by weight). The coating on steel reinforcement is used to determine the level of resistance to chloride ingress. Rapid chloride permeability test, scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier-transform infrared (FTIR) analyses revealed that the 20% barite polyurethane coating is the most resistant to chloride ingress, with a reduction of 95% in chloride permeability compared to the standard coatings, which passed 4215.32 Coulombs. The rapid chloride permeability test charge for the 20% barite polyurethane coating is only 196.8 Coulombs; thus, the material exhibits excellent resistance to chloride ingress. The SEM research showed that there is a very close interfacial contact between fillers and the polyurethane, and this contact is responsible for stability in the coating. The researchers found that the usage of the 20% barite-filled polyurethane coating is an excellent means of extending the service life of reinforced concrete that is subjected to extreme conditions. Thus, it is an environmentally friendly, affordable, and efficient method of corrosion protection in concrete structures.</p>