Zincalume® Plus AZ-55 combines a 55% aluminum, 45% zinc alloy coating with a clear acrylic resin layer over 26-gauge steel (approximately 0.018 inches thick). The resin coating solves several jobsite headaches — it resists scuff marks and fingerprints during handling, prevents wet-stack storage staining, and reduces or eliminates the need for roll-forming lubricants. For contractors running mixed panels through their equipment, this coating matters. The resin naturally dissipates over 12-18 months if left unpainted, or contractors can paint directly over it with water-based acrylics without primer.
Clear Acrylic Resin Technology
The coating changes how contractors handle unpainted metal. The excellent lubricating qualities reduce or eliminate roll-forming lubricants — anyone who’s dealt with lubricant cleanup knows the value here. It provides flexibility to interchange roll-formed metallic and pre-painted products without the usual contamination concerns.
Resin coating keeps rolls and dies cleaner and eliminates the need for roll cleaning before running pre-painted sheet. On jobs where both painted and unpainted panels run through the same equipment, this saves real time. The coating also addresses a common field problem — contractors can use water-based acrylic finish coats directly without primer when touch-ups or field painting becomes necessary.
Performance Specifications and Testing
The SRI (Solar Reflectance Index) hits 65, making this a legitimate cool roof option for Montana’s intense summer sun. The testing credentials back up field performance:
| Specification | Value | Source |
|---|---|---|
| Gauge | 26 | manufacturer |
| Nominal Thickness | 0.018 inches (0.45 mm) | manufacturer |
| SRI (Solar Reflectance Index) | 65 | tested (ASTM E1980) |
| Coating Composition | 55% Aluminum, 45% Zinc | manufacturer |
| Surface Finish | Clear acrylic resin over metallic | manufacturer |
Testing includes ASTM E1980 for SRI, UL 580 for uplift resistance, ASTM E1592 for structural performance, and ASTM E330 for wind loading. Note that the structural tests depend on panel profile — the coating doesn’t change the gauge’s inherent strength limits.
Warranty Coverage
Zincalume® Plus carries a 25-year perforation warranty against rust caused by material defects, while no finish warranty applies since it’s supplied as a raw metallic finish with clear resin. Edge cut corrosion falls outside warranty coverage — standard practice but worth noting for field-cut penetrations.
Installation and Handling
Storage matters with this product. Store in a dry, well-ventilated area, off the ground and under cover, with one end elevated to allow drainage to prevent water/condensation buildup. Montana’s temperature swings make proper storage critical.
Installation must allow for thermal movement of panels and flashings — standard practice but especially important with Montana’s 100°F+ temperature swings between summer and winter. Oil canning (waviness) is normal for light-gauge metals and not a cause for rejection — contractors should set customer expectations accordingly.
The product works with multiple panel profiles: StreamLine™, Easy-Lock™, MS-150™, MS-100™, Classic Corrugated, GR-7™, and Slim-Lock™. Compatible fasteners include through-fasteners with rubber washers and concealed fastener clips like AMSCLIP150.
The Real Value Proposition
Zincalume® Plus AZ-55 fills a specific niche — contractors who need better performance than G-90 galvanized but don’t want painted panel costs. The clear resin coating solves practical problems: cleaner equipment, easier handling, field-painting flexibility. The 25-year warranty beats no-warranty galvanized. The SRI 65 rating qualifies for cool roof applications.
For Montana contractors dealing with short construction seasons, the handling benefits matter. Less equipment cleaning between product runs. No primer needed for field touch-ups. For field painting, surface must be clean and dry — then straight to topcoat.
The product makes sense for agricultural buildings, commercial projects where the metallic finish works aesthetically, and anywhere the budget sits between basic galvanized and premium painted systems. Not the cheapest option. Not the most expensive. But for contractors who understand the value of easier handling and a 25-year warranty, it earns consideration.
Frequently Asked Questions
Q: How long does the clear resin coating last if left unpainted?
A: The clear resin coating naturally dissipates over 12-18 months if unpainted. This is normal and expected behavior — the coating serves its purpose during storage, handling, and installation.
Q: Can I paint Zincalume® Plus without primer?
A: Yes. Use a water-based acrylic finish coat with no primer required. The surface must be clean and dry before painting.
Q: What’s the actual warranty coverage?
A: 25 years against perforation due to rust caused by material defects. No finish warranty applies since it’s a raw metallic product. Corrosion due to edge cut erosion is not covered.
Q: Does the resin coating affect roll-forming operations?
A: It improves them. The coating has excellent lubricating qualities that reduce or eliminate the need for roll-forming lubricants. It keeps rolls and dies cleaner and eliminates the need for roll cleaning before running pre-painted sheet.
Q: Is oil canning a defect with this product?
A: No. Oil canning (waviness) is a normal characteristic of light-gauge metals and is not a cause for rejection. This applies to all 26-gauge products, not just Zincalume® Plus.
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