A coating may appear flawless at the time of application, only to begin peeling or corroding a few months later. In most cases, the cause is not the coating itself, but the condition of the surface before it was applied. Preparing the metal surface is the stage that largely determines how long the coating will ultimately last.
Why Surface Preparation Is Critical
A coating requires a clean and stable surface to achieve proper adhesion and create a durable bond. Rust, old paint layers, oil, salts, or dust trapped between the metal and the new coating act as barriers: they reduce adhesion and accelerate corrosion beneath the coating, even if the surface appears visually sound.
The Main Stages of Surface Preparation
Proper metal surface preparation before painting typically includes:
Removal of rust, old paint layers, and surface deposits
Cleaning away oil, salts, and dust that would interfere with adhesion
Creating the appropriate surface profile (roughness) to ensure the new coating achieves proper mechanical adhesion
Checking environmental conditions (humidity and temperature) before applying the coating
The Methods Used
Depending on the condition of the surface and the project requirements, surface preparation can be carried out using hydro blasting or abrasive water blasting. These methods effectively remove rust and old coatings without damaging the underlying metal. The choice of the appropriate method depends on the type of surface, the thickness and condition of the existing coatings, as well as the specifications provided by the coating system manufacturer.
From Surface Preparation to Coating Application
Once the surface has been properly prepared, the coating is applied using state-of-the-art AIRLESS spray equipment, in accordance with manufacturers’ specifications and international ISO standards. Epoxy, polyurethane, fire-resistant, and other coating systems are selected based on the corrosion protection requirements of each project. Without proper surface preparation, however, even the highest-quality coating system cannot deliver the long-term protection it was designed to provide.
STEPE Ltd.’s Expertise in Metal Surface Preparation and Painting
STEPE Ltd. combines its expertise in high-pressure water jetting and abrasive water blasting with specialized painting and coating services, providing a complete solution from surface preparation through to final coating application. Using certified procedures and high-quality materials, the company undertakes painting and corrosion protection projects for industrial facilities, ships, and engineering structures of every scale.