Steel Shield and Alumi Shield Start with Different Metals
When it comes to powder coating, the first question is not simply which colour or finish you want. Before drawings are released, we recommend confirming what metal is being coated, where it will operate and which warranty outcome the project requires. A system suitable for aluminium cannot automatically be transferred to steel, and Steel Shield does not automatically apply to galvanised steel, stainless steel or other non-eligible steel substrates.
Dulux Steel Shield and Alumi Shield are not interchangeable because they apply to different substrates and address different failure modes. Alumi Shield is Dulux’s project warranty framework for eligible architectural aluminium, covering colour performance and film integrity. Steel Shield is for eligible mild steel, covering colour performance and corrosion protection. A Dulux powder product alone does not create either warranty: substrate, environment, specification, accredited application and process must align.
Early review can help project teams translate warranty requirements into practical decisions for fabrication, surface preparation, coating application and project records. That review is most useful before production begins, when changes can still be made without disrupting the program.
Warranty Components Change with the Substrate
Dulux separates warranty components according to the substrate. This matters because colour performance, film integrity and corrosion protection are different measures of coating performance. Here’s where the differences sit:
- A colour warranty addresses fade and chalking.
- An aluminium durability warranty addresses film integrity, meaning the coating should not peel, crack or flake for a specified period when correctly specified and maintained.
- A steel corrosion warranty addresses corrosion protection for eligible steel substrates.
Alumi Shield is structured around aluminium durability and colour performance. Steel Shield is structured around steel corrosion and colour performance. Steel Shield corrosion cover should not be described as a film-integrity warranty, and Alumi Shield should not be treated as steel corrosion cover.
Dulux Warranty Framework by Substrate
Now we’ll go through each Dulux warranty framework, matching substrate to warranty components and the specification checks that keep a project on track.
Eligible architectural aluminium:
- Applicable framework: Dulux Alumi Shield
- Warranty components: Colour warranty for fade and chalking, durability warranty for film integrity
- Key specification checks: Project type, environmental exposure, product selection, accredited aluminium application and maintenance requirements
Eligible mild steel, bright or semi-bright steel, black or blue steel:
- Applicable framework: Dulux Steel Shield
- Warranty components: Colour warranty for fade and chalking, corrosion warranty
- Key specification checks: Steel eligibility, fabrication design, blast-cleaning and preparation, system configuration, accredited steel application and maintenance requirements
Galvanised coated steel and other non-listed steel types:
- Applicable framework: Not automatically eligible for Steel Shield
- Warranty components: Must be confirmed for the particular substrate and coating system
- Key specification checks: Manufacturer and applicator advice before specification or fabrication release
Dulux Accredited Powder Coater materials and warranty documentation set out the full terms, project classifications and exclusions. Those details should be confirmed with Dulux’s specifications for each project.
Accreditation and Pre-Approval Support Warranty Grade Work
Specifying a Dulux powder coating product does not, by itself, create a project warranty. The selected product must be suitable for the project, and the work must be completed by a Dulux Accredited Powder Coater to the relevant warranty specification and conditions.
Accreditation is not a marketing label. It is part of the control system linking product selection, applicator capability, application quality and project warranty eligibility. Dulux Accredited Powder Coaters may hold accreditation for aluminium, steel or both.
Project teams should involve an appropriate applicator early enough to confirm whether the steel substrate, proposed powder, exposure classification, fabrication details and warranty expectations can be aligned before coating work is scheduled.
Dulux warranty conditions require accredited application, correct specifications, project suitability and maintenance. Project-specific eligibility and any approval requirements should be confirmed with Dulux before work proceeds.
Steel Eligibility Begins Before Fabrication
Steel Shield applies exclusively to mild steel, bright or semi-bright steel, and black or blue steel where Dulux conditions are met. It does not automatically cover galvanised coated steel or other steel types. That distinction needs to be resolved before fabrication drawings, material purchasing and coating specifications are finalised.
Fabrication details can affect corrosion performance long before an item arrives at the coating line. Narrow crevices, unsealed hollow sections, water traps, sharp edges and inaccessible internal surfaces can create points where moisture remains or coating coverage is difficult to achieve. Where required by the specification, exposed areas and hollow sections need appropriate sealing.
Preparation may include:
- Washing and degreasing to remove contaminants.
- Edge grinding to reduce sharp profiles.
- Abrasive blast cleaning to SA 2.5 where required by the Dulux warranty specification.
- Controlled preparation and coating records matched to the project requirements.
IPC Project Review Insight
Warranty risks can arise before the item reaches the coating line, particularly where fabrication details create moisture traps, sharp edges, inaccessible internal surfaces or unclear substrate identification. Early specification review gives the project team time to address these matters before fabrication is complete.
Technical review should consider the applicable Dulux documentation, substrate, coating system, environmental exposure and project requirements.
Product, Exposure and Maintenance Set the Term
Warranty periods are product-specific. Under Steel Shield, corrosion warranty periods are listed as up to 10 years for eligible products and projects, while colour warranty terms range from 10 to 30 years depending on the product.
Alumi Shield terms also vary by product family, project type and environmental conditions. Dulux documentation should be checked for the applicable durability and colour warranty periods, exclusions and product suitability for each project.
Environmental conditions also shape suitability. Both frameworks require suitable pH conditions, generally between pH 5 and 9, and are not suitable for strongly acidic or caustic conditions. Alumi Shield is not suitable for immersion in liquids. Coastal exposure, pools, fountains and other nearby liquids may affect product selection and warranty availability.
Dulux aluminium product guidance references internationally recognised AAMA performance standards, including AAMA 2603, AAMA 2604 and AAMA 2605. A documented maintenance program is required to retain warranty compliance.
Review the Warranty Pathway Before Release
The warranty pathway is a chain: substrate, project type, environmental exposure, coating product, system build, accredited applicator, controlled preparation, documented application and maintenance. If one link is missing, the required warranty may not be available.
Alumi Shield is the appropriate Dulux framework for eligible aluminium requiring colour and film-integrity assurance. Steel Shield is the appropriate framework for eligible mild steel requiring colour and corrosion protection. Early project review allows the coating pathway to be assessed against the substrate and warranty outcome before fabrication locks in avoidable risks.
Confirm The Right Coating Pathway
Ipswich Powder Coating can review your substrate, project environment and specification requirements before coating begins. Work with a Dulux Steel Shield applicator in Queensland to assess suitable preparation, coating and warranty pathways for eligible steel. For project-specific guidance or a quotation, get in touch to share the details of your project.












