Steel Coating

9 October 2025

SealteQ

Steel

Steel coating is an effective way to provide long-term protection for steel structures against rust formation, fire, mechanical stress and weather influences. SealteQ is a specialist in high-quality steel coatings, applied in various sectors, including industry, infrastructure and utility construction. With years of experience and a technically advanced approach, we realize coating systems that meet the strictest requirements.

In this article you will read about the benefits and how we approach steel coating at SealteQ, from initial inspection to execution and quality control.

Steel is a strong construction material, but without protection it is susceptible to corrosion. Exposure to moisture, oxygen and industrial influences causes rust, which affects the strength and durability of the material. Galvanic corrosion can also occur when in contact with other metals in humid conditions. By applying a coating, the steel surface is sealed from harmful influences, preventing rust formation.

Steel coating offers benefits such as:

Long-term corrosion protection
Less maintenance and lower failure costs
Improved fire safety
Enhancement and color consistency
Compliance with NEN standards and environmental regulations

Whether it concerns new constructions or restoring existing systems, a properly applied coating is essential for the reliability and lifespan of steel structures.

At SealteQ we apply various coating systems, tailored to the application, environmental factors and project requirements. We always work based on applicable standards, such as NEN-EN-ISO 12944, and ensure customized solutions that align with your project objectives.

Steel Preservation

Steel coating is part of our steel conservation specialty. Steel conservation is intended to protect steel and preserve it as long as possible. Through steel coating, among other things, the surface is sealed from external influences. This keeps the structure safe, stable and aesthetically in good condition, with lower maintenance costs in the long term.

Thanks to our mobile equipment, we can conserve steel at any location in the Netherlands. Our mobile conservation units are equipped with:

Mobile blasting and spraying equipment
Metallizing installations (including Thermal Sprayed Aluminium)
Extraction and filter units (including dust reduction and ventilation)
Power generators
Lighting and communication equipment

This makes steel preservation possible in operational environments such as hospitals or factories, without prolonged downtime or disruption of processes.

For projects that benefit from controlled conditions, we have two fully equipped conservation halls in Bergum and Bergharen. Here we perform surface treatment, metallizing and coating with maximum control over quality, layer thickness and adhesion. Our halls are suitable for large steel structures and feature advanced spraying and lifting installations.

Fire resistant coating

Making steel fire-resistant is mandatory in many buildings and installations. SealteQ is a specialist in applying fire-resistant coatings to steel structures according to requirements for 30, 60, 90 or 120 minutes fire resistance.

Our approach is as follows:

Application of certified fire-resistant systems
Application of multiple layers with controlled coating thickness
Continuous measurement and inspection during application
Final certification upon approval

These coatings are indispensable for buildings where structural integrity during fire must be guaranteed, such as parking garages, healthcare facilities or public buildings.

Powder Coating

Powder coating steel is a modern method where an electrostatically charged powder is applied to the steel and then cured in an oven. This coating method is particularly suitable for:

High wear resistance
Smooth finish and color fastness
Environmentally friendly application (without solvents)

Powder coating is applicable for indoor and outdoor applications, where requirements apply to appearance, durability and ease of maintenance.

Please note: SealteQ does not have its own powder coating installation or cabin, but applies this technique in collaboration with regular partners.

Specialized Applications

Depending on the situation, we also offer:

Coatings for applications with high chemical resistance.
Systems suitable for humid or sterile environments (such as in the medical sector).
Recoating of existing systems, provided the substrate and adhesion are suitable.
Combination solutions with, for example, thermal galvanizing of steel for extra protection.

At SealteQ, a careful process approach is central. Each coating process begins with proper preparation of the steel surface, followed by professional application and completion with strict quality control.

1. Pre-treatment and surface preparation

A durable coating begins with the right steel surface treatment. Depending on the type of project and the condition of the steel, we apply:

Degreasing and cleaning
Steel blasting for an active substrate
Sanding or light profiling

The right pre-treatment increases adhesion, extends the system’s lifespan and prevents premature weakening of the coating.

2. Application of steel coatings

Our specialists apply coatings using:

Airless spraying (for larger surfaces or fire-resistant systems)
Electrostatic powder coating (in the workshop)
Rolling or dipping (for specific applications)

During application, we carefully consider the drying time between layers, the desired layer build-up and control of coating thickness. We also ensure optimal coverage and uniform surface finishing.

3. Quality control and inspection

During and after coating, we measure the coating thickness, the quality of adhesion (pull-off test if required) and the uniformity of coverage.

All data is recorded and, if desired, provided with inspection reports or certification, ensuring you are assured of the quality of the final result.

Our steel coatings are applied in various sectors and projects. Think of bridges, locks, viaducts and rail infrastructure, but also steel structures in hospitals, parking garages and other utility buildings. In addition, we treat pipeline networks, storage tanks, industrial installations and maritime applications. We also offer suitable coating solutions for renovation projects and maintenance.

We deliver both in our own workshop and on location, with mobile coating units that meet the highest requirements for safety and environment.

Are you looking for a partner for professional steel coating? Our specialists are happy to advise you on the most suitable system for your application. Contact us for:

A non-binding consultation
Technical inspection and reporting
A customized quote for coating projects

We are happy to help you extend the lifespan of your steel structure.

Contact us

What is the Difference between Powder Coating and Thermal Galvanizing?

Powder coating is applied electrostatically and cured, while thermal galvanizing of steel creates a zinc layer through immersion in molten zinc. Each system has its own advantages depending on application and environment.

How Long Does a Coating Last under Industrial Conditions?

This depends on the layer build-up, load and environment. A properly applied coating system can last up to 20-30 years, provided it is well maintained.

Can a New Layer be Applied over an Existing Coating?

Yes, recoating is possible provided the substrate is sufficiently intact and properly prepared. Our specialists perform inspections for this purpose.

Which Coating is Suitable for Outdoor Use or Chemical Exposure?

For outdoor use, coatings with high UV resistance and weather resistance are required. For chemical exposure, we recommend specific epoxy or polyurethane systems.

How is the Quality of the Coating Controlled?

We measure coating thickness, check adhesion and perform visual and technical inspections. If desired, we provide an inspection report or certificate.

MultiPaint Steel Preservation and MCB coating terminal Arnhem

Preservation of steel structure (5000 m2)

3,000m² steel preservation job Groningen

Commissioned by the construction consortium OV Terminal Arnhem (Ballast Nedam Bouw and BAM Utiliteitsbouw), MultiPaint Staalconservering B.V., in collaboration with MCB from Bergharen—both part of the SealteQ Group—coated the steel structure of the terminal's waiting area.

On behalf of Arendsen Steel from Ulft, the specialists of SealteQ MCB are busy with the preservation of a large steel structure with approximately 5000m2 of material surface.

In Groningen, the specialists from SealteQ Noord are working on an extensive steel conservation project. The project, covering an area of no less than 3,000 m², focuses on conserving the entire steel structure of the building. This requires not only technical expertise but also a meticulous approach that characterizes our team.