Structural steel forms the backbone of modern construction, with beams, joists, framing and purlins playing critical roles in building integrity. However, these steel components often endure prolonged exposure to harsh environmental conditions—sun, rain and fluctuating temperatures—while stored in laydown yards before installation. This exposure significantly increases the risk of corrosion and rust, threatening the longevity and safety of steel structures.
The Importance of High-Performance Primers in Steel Protection
High-performance primers act as the first line of defense, preserving the structural integrity of steel during storage and staging.
Factory-applied primers provide a durable, water-resistant layer of protection that extends asset life, prevents degradation, reduces maintenance and surface preparation work such as sandblasting before installation and finishing. This protective layer translates into substantial savings in time, labor and overall project costs throughout the asset lifecycle.
The Shift from Solvent-Based to Waterborne Primers
While conventional solvent-based primers remain the most widely used, waterborne solutions have gained significant traction over the last decade, primarily due to lower volatile organic compound* (VOC) content than traditional solventborne primers. Because they are sustainably advantaged, they are often specified as the technology of choice, particularly in government-funded projects.
Challenges with Conventional Waterborne Primers
Despite their environmental advantages, traditional waterborne primers have faced three main challenges:
- Slow Drying Times: Conventional waterborne primers typically require 12 to 24 hours to fully cure, causing production delays and necessitating large storage areas for drying parts before shipment.
- Surface Defects: Issues such as mud cracking can compromise both the aesthetic quality and protective performance of the primer.
- Environmental Sensitivity: Variations in temperature and humidity often demand region- or season-specific formulations, complicating product specification and inventory management.
PPG AQUACRON® Waterborne Shop Primers: A Breakthrough in Steel Protection
After nearly two years of dedicated research and development, PPG has introduced AQUACRON® Waterborne Shop Primers (WSP), a revolutionary solution engineered specifically for structural steel applications. These factory-applied primers combine low VOC emissions1 with rapid curing, a smooth finish and exceptional stability across diverse climate conditions, an unprecedented balance of properties for waterborne technologies. 1
Key Benefits of PPG AQUACRON® Waterborne Shop Primers
- Rapid Drying: Unlike traditional waterborne primers, PPG AQUACRON® WSP dries in just two minutes under standard heat conditions. This rapid cure time enables high-volume steel fabricators to increase throughput, reduce bottlenecks and minimize the space required for drying and curing.
- Low VOC Emissions1: With VOC levels similar to those found in standard residential-grade paints, these primers help manufacturers comply with stringent environmental regulations while enhancing long-term durability and corrosion resistance.
- Climate Stability: A single, versatile formulation performs consistently across all environmental conditions, eliminating the need for multiple region-specific products and simplifying procurement and specification processes.
- High Finish Quality: The smoother surface finish improves both the appearance and protective qualities of the primer, ensuring optimal performance throughout the steel’s service life.
A Benchmark Innovation
Waterborne primers have been used in steel production for over a decade, but their slow drying times, environmental sensitivity and surface imperfections have limited their broader adoption. PPG AQUACRON® WSP addresses these challenges head-on, delivering a faster, more reliable, and environmentally responsible solution.
“Developing a lower VOC, faster drying formulation with a smoother finish and adaptable across environmental conditions is a benchmark achievement in waterborne primers”, explained Brian Smith, PPG business manager for liquid coatings in Industrial Coatings. “This innovation perfectly illustrates PPG’s commitment to sustainably advantaged solutions that deliver on durability, performance and efficiency.”