What is the Best Paint for Steel Siding?

Why Paint is Essential for Steel Warehouse Building Siding

The exterior siding on a steel warehouse building will continuously be subjected to extreme weather and environmental conditions such as rain, snow, ultraviolet light and salt air. Steel will corrode if not protected adequately, and will eventually cause damage to the structure and cost a lot to repair.

A high-quality paint system for your custom steel structure warehouse provides:

• Superior corrosion resistance
• Excellent UV protection
• Reliable waterproof performance
• Long-term durability
• Low maintenance requirements
• Enhanced aesthetic appeal

The Best Paint System for Prefab Steel Warehouse Siding

After extensive testing on industrial steel structure warehouse projects across different climates, we have determined that a three-step surface treatment and two-coat paint system offers the best protection for steel storage warehouse siding.

Compared with ordinary coatings, structural steel paint has stronger adhesion, weather resistance, and durability, making it the core material to ensure the service life of steel structures.

Step 1: Sandblasting Surface Preparation

Even the highest quality paint will fail if applied to a poorly prepared surface. That’s why we always start with thorough sandblasting of all prefabricated steel warehouse components.

By removing all rust, mill scale, oil, and other contaminants from the steel, sandblasting creates a rough surface and allows for proper adhesion of paint to the steel. The long term performance of your industrial storage building siding relies on this step being performed correctly.

Step 2: Zinc-Rich Primer Application

The first primary coat of paint applied is a good-quality zinc-rich primer which can provide excellent corrosion protection due to cathodic protection; in this mechanism, zinc serves as a sacrificial electrode and will be corroded before that steel.

All our steel structure warehouse components receive a zinc-rich primer application as part of our standard production process.

Step 3: Durable Industrial Topcoat

The Finished layer is a highly durable, industrially graded topcoat, designed to provide UV protection and weather resistance with the colour and finish you desire. We use only topcoat finishes that are specifically designed for Steel Structure Warehouse Applications, capable of withstanding extreme temperature fluctuations and the harsh elements of nature.

This complete system ensures that your prefabricated steel structure warehouse siding remains protected for up to 50 years with proper maintenance.

Paint Recommendations for Different Climates

The best paint system for your steel frame warehouse siding also depends on the climate where your steel warehouse building will be located.

Cold Climates

For cold climate, custom steel structures, we would recommend a paint system that will be able to withstand the extreme temperature changes and freeze/thaw cycles to which it will be exposed during the winter. Our normal (zinc rich) primer/topcoat system is designed for cold weather applications and has been used on numerous projects in Russia and Canada.

Humid Climates

Moisture in humid climates represents the greatest risk to the steel panel sidings of Pre-Engineered steel building warehouses. We have developed a unique paint and coating system with integrated corrosion inhibitors that provide excellent rust prevention capabilities for structures located in humid climates, such as Southeast Asia or the Caribbean.

Coastal Climates

There are so many harsh conditions in coastal areas that a steel warehouse building gets hammered with saltwater exposure! That’s why we have special coatings that will help protect your warehouse from both salt spray and coastal corrosion.

Professional Factory Application vs On-Site Painting

While some customers consider on-site painting to save costs, we strongly recommend professional factory application for your steel storage warehouse siding.

Factory application offers several key advantages:

• Controlled environment conditions ensure better paint adhesion
• Uniform, consistent finish across all components
• Faster overall project completion time
• Higher quality application using specialized equipment
• Components arrive at your site ready for immediate installation

All the building components that make up our storage buildings are painted at our advanced factory and facility prior to being shipped to you to ensure they have the best quality finish possible and are of maximum protection.

Conclusion

A complete three-step system, which includes sandblasting to prepare the steel surface, a zinc-rich primer, and an industrial strength topcoat is, by far, the best option for painting steel siding. This system provides excellent corrosion resistance, UV protection and durability over time for your steel structure warehouse.

Bingfa Steel has implemented a policy of using only the highest quality paint systems available in the manufacture & production of our steel structure buildings used as warehouses. Our typical surface preparation method allows for the commercial steel building to have the 50+ year life span of your pre-engineered steel structure warehouse in even the worst possible conditions.

If you’re planning on constructing a steel framed warehouse, reach out to our team to find out about the paint and surface treatment options available for your project. We will happily provide you with a free estimate and work with you to determine the appropriate paint system for your application.