Unprotected steel is highly susceptible to a range of damaging factors. Exposure to the elements, such as rain, moisture, and UV rays, can cause steel to corrode, rust, and weaken over time. In environments with chemicals or saltwater, the damage can be even more rapid and severe, leading to compromised structural integrity.
Fortunately, spray painting offers a comprehensive solution to these problems. More than just an aesthetic enhancement, spray painting provides essential protection that shields steel from potential damage. Let’s explore the many ways spray painting can enhance steel, ensuring it stays durable, protected, and visually appealing for years to come.
Rust and Corrosion Protection
Steel is prone to rust when exposed to moisture and oxygen, leading to corrosion over time. Spray painting creates a protective barrier that prevents water and oxygen from penetrating the steel surface, significantly reducing the risk of rust and extending the life of the structure. Rust not only affects the appearance of the steel but also weakens its integrity, which can lead to costly repairs or replacements.
Paint with zinc primers is particularly effective in preventing corrosion. are particularly effective in preventing corrosion. High-build epoxy mastic and polyurethane top coats offer an extra layer of protection, as they provide superior water resistance and are also UV stable, preventing further breakdown.
Prevention of Concrete Cancer
When steel reinforcing bars inside concrete corrode, they expand and cause the surrounding concrete to crack and weaken—a process known as concrete cancer. Spray painting the steel before it is encased in concrete helps prevent moisture penetration, reducing the likelihood of concrete cancer and preserving the structural integrity of buildings, bridges, and other infrastructure.
Heat and Fire Resistance
Specialised spray paints, such as intumescent coatings, provide superior heat and fire resistance. In the event of a fire, these coatings expand and form an insulating layer that helps to slow down the spread of heat, giving people more time to evacuate and reducing structural damage. This is especially critical in industrial and commercial settings where fire safety regulations are stringent.
For heat and fire resistance, intumescent coatings or epoxy-based primers are ideal. These coatings expand when exposed to high temperatures, forming an insulating layer that protects the steel. Isocyanate-free urethanes are another great option for top coats, providing superior fire resistance and preventing the rapid spread of heat during a fire.
Chemical and UV Protection
Steel structures exposed to harsh environments, such as chemical plants or outdoor areas with high UV exposure, can deteriorate quickly without the proper protection. Spray paints designed for chemical resistance shield steel from exposure to corrosive substances, while UV-resistant coatings prevent fading, cracking, or weakening due to sunlight.
Steel structures in chemical plants or outdoor environments with high UV exposure require specialised coatings. Chlorinated rubber coatings offer strong resistance against chemical corrosion and can be paired with fast dry enamels for efficient protection. In UV-heavy environments, polyurethane top coats provide excellent resistance to sunlight, preventing cracking and fading.
Aesthetic Appeal and Branding Opportunities
Beyond protection, spray painting allows for customisation and branding. For commercial buildings, retail spaces, and public structures, the uniformity and smooth finish of spray paint can enhance the visual appeal of steel, turning it into an attractive architectural feature. Spray painting also allows for the integration of company colours or branding elements, providing both form and function.
Reduced Maintenance Costs
Spray painting structural steel reduces ongoing maintenance costs. By protecting steel from rust, corrosion, and environmental damage, it minimises the need for costly repairs, recoating, or full replacements. Many modern spray coatings are designed to last for years with minimal upkeep, providing a long-term, cost-effective solution.
Resistance to Weather and Moisture
Whether it’s rain, humidity, or saltwater, spray painting creates a strong barrier against moisture. This is particularly valuable in coastal or marine environments where steel is constantly exposed to saltwater, which accelerates rust and corrosion. Proper spray painting can ensure the steel stays intact, even in the most challenging climates.
In marine or coastal environments where moisture and salt exposure is constant, water-based primers are eco-friendly options, providing a smooth barrier against moisture. For tougher environments, a high build epoxy mastic paired with a polyurethane top coat provides superior resistance to moisture and saltwater damage.
Protect Your Steel Structures for Long-Lasting Durability and Protection
At APT, our team of professional spray painters is dedicated to delivering the highest level of protection for your steel structures. Whether it’s for commercial, industrial, or architectural purposes, we ensure that your steel will stand the test of time. Get in touch with us today to learn how our spray painting process can give your steel the ultimate defence it needs to remain durable, safe, and visually appealing for years to come.
