A good finish does two things: protects your steel and makes it present well. Steelmart can prime structural steel in-house, then coordinate the right final finish through trusted finishing partners — including powder coating, hot dip galvanising, and architectural paint systems.
What is metal finishing / metal coating?
Metal finishing is the coating stage that improves corrosion resistance, durability, and appearance. The best finish depends on; where the steel/aluminium will live (indoor/outdoor/coastal), how exposed it is to weather or chemicals, and whether it’s a visible architectural element or purely functional
Finishes we can coordinate (steel + aluminium)
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Painting
For projects that require a specific architectural finish, we can coordinate professional paint systems suited to steel or aluminium.
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Powder coating
Powder coating is a durable, clean-looking finish chosen for visible steelwork and colour-matched architectural projects.
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Hot dip galvanising
Hot dip galvanising provides strong corrosion protection for outdoor, coastal, and harsh exposure environments where long life matters.
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Primer coating
For structural steelwork, we apply primer in-house where required to protect steel and prepare it for its final coating system.
Types of metal finishing
The right metal finishing system protects fabricated steel from corrosion, improves its appearance and helps extend its service life. Steelmart can coordinate metal powder coating, architectural painting and hot dip galvanising through trusted specialist finishers, while structural steel can be primed in-house where required.
Powder coating
Powder coating creates a smooth, durable coloured finish that works particularly well on visible steel and aluminium products. The dry powder is electrostatically applied to the prepared metal and then cured under heat, forming a hard, consistent coating.
It is a popular metal finishing choice for:
- gates and fencing components
- handrails and balustrades
- screens and architectural metalwork
- brackets and fabricated frames
- aluminium window hoods and other visible components
Powder coating is available in a wide range of colours, textures and gloss levels, making it a practical option when both presentation and durability matter. Correct surface preparation and curing are essential to achieving an even finish with good adhesion and long-term performance.
Hot Dipped Galvanising
Hot dip galvanising is used when long-term corrosion protection is the main priority. The fabricated steel is chemically prepared and immersed in a bath of molten zinc. The zinc reacts with the steel to form a bonded protective coating across the surface, including many edges, corners and otherwise difficult-to-reach areas.
This makes hot dip galvanising particularly suitable for:
- structural steel exposed to weather
- outdoor platforms, frames and supports
- rural and industrial steelwork
- external stairs, handrails and barriers
- gates, brackets and fabricated components
- steel installed in high-moisture or corrosive environments
Unlike paint, which forms a coating over the steel, hot dip galvanising creates a metallurgically bonded zinc layer. It also provides sacrificial protection, meaning the surrounding zinc can continue protecting small areas of exposed steel if the coating is scratched or damaged.
The final galvanised finish is generally more functional and industrial in appearance than powder coating or architectural paint. The fabrication must also be designed to allow safe venting, drainage and full zinc coverage during the galvanising process.
Architectural and protective painting
Where a particular colour, sheen or architectural finish is required, Steelmart can also coordinate professional painting through experienced coating contractors. Depending on the environment and project specification, this may include systems such as:
- zinc-rich primers for added corrosion protection
- epoxy primers and intermediate coats
- polyurethane topcoats for colour retention and exterior durability
- architectural paint systems for visible steel and aluminium
- specialised primers designed to bond correctly to aluminium
Painted finishes are commonly used on structural steel, architectural frames, exposed beams, columns, handrails and other fabricated products where appearance needs to align with the wider building design.
Choosing the right metal coating
Powder coating is generally selected for its clean appearance, colour range and durable finish. Hot dip galvanising is normally chosen where strong, long-term corrosion protection is more important than achieving a perfectly smooth architectural surface. Professional paint systems provide greater flexibility where a project requires a specified colour, gloss level or protective coating system.
In some demanding environments, a duplex coating system may be used, combining hot dip galvanising with a compatible paint or powder-coated finish. This can provide additional corrosion protection while also achieving the required colour and appearance.
Steelmart helps coordinate metal finishing for both one-off fabricated components and larger project packages. Products we commonly arrange finishing for include gates, handrails, screens, brackets, structural steel, platforms, frames and architectural metalwork.
When customers search for metal finishing near me, they are usually looking for more than a coating applicator. They need fabrication, surface preparation and finishing requirements to work together. By coordinating the process from the start, we help reduce unnecessary handling, avoid coating problems and deliver fabricated metalwork with a finish suited to its environment, appearance requirements and budget.
How our finishing coordination works
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Step 1 - Specifications
Confirm the environment + finish expectations:
- Indoor, outdoor, coastal setting?
- appearance (high spec architectural, industrial, etc.)
- Colour, texture, sheen
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Step 2 - Prep
Completed in-house with Steelmart fabricators:
- Sanding, buffing and cleaning
- apply primer to structural steel in-house if required
- Package for transport
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Step 3 - Offsite
We coordinate with specialist contractors to obtain the desired finish:
- Powdercoating
- Painting
- Hot dipped galvanising
- Pickling and passivation (stainless steel)
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Step 4 - Delivery
Package and dispatch so it arrives site-ready, with consideration made to protect and preserve the desired finish
Common paint systems used on steel and aluminium
Different jobs call for different systems. These are the common approaches you’ll see used in architectural and industrial metal finishing:
1) Prep + Primer + Topcoat (standard paint system)
A common system for fabricated steelwork where the steel is properly prepared, primed, then finished with one or more topcoats. Suitable for many external and internal architectural applications when specified correctly.
2) Epoxy primer + polyurethane topcoat (high durability)
Often used where you want a tougher coating system with strong adhesion and long-term durability — particularly useful for exterior exposure, industrial settings, and high-wear fabricated items.
3) Zinc-rich primer systems (corrosion-focused paint systems)
Used when corrosion protection is a priority and the spec calls for zinc-rich primers as part of the coating system. Often paired with suitable intermediate/topcoats depending on environment.
4) Aluminium-specific primer systems
Aluminium needs the right prep and primer to ensure adhesion and long-term performance. A proper aluminium paint system is about correct surface preparation + compatible primers/topcoats.
The right system depends on environment, exposure category, and the finish level you want. We’ll help you select the most practical option.
FAQs
Do you do metal finishing in-house?
We prime structural steel in-house, and we coordinate powder coating, painting and hot dip galvanising through trusted finishing partners. This gives you access to the right equipment and coating processes without the project turning into multiple separate handovers.
What factors affect the cost of metal finishing?
Cost is usually driven by:
- item size and shape (complexity affects prep and coverage)
- coating type (powder coating vs hot dip galvanising)
- required surface preparation
- volume/quantity and handling requirements
What’s the difference between powder coating and galvanising?
- Powder coating is mainly chosen for appearance and colour, with a durable protective finish.
- Hot dip galvanising is chosen for maximum corrosion protection, especially outdoors.
Can you do both galvanising and painting?
In some cases, yes — projects may specify a galvanised base with an additional top coat for extra protection and appearance. If that’s required, we’ll confirm the correct process and feasibility for your items.
How is surface preparation done before applying metal coatings?
We clean the steel by removing rust, oil dirt and mill scale. This is done through chemical treatment or sandblasting so the coating sticks properly and lasts longer.
How do you ensure a quality finish?
Quality comes down to clear requirements and correct preparation. We confirm the intended environment and finish expectations upfront, then coordinate the right finishing process through specialist coaters to suit the job.
What information do you need to quote or coordinate finishing?
A quick description of:
- what the items are (type, quantity, approximate sizes)
- where they’re going (indoor/outdoor/coastal)
- your preferred finish (powder coat colour, galvanising requirement, etc.)
- your timeframe and delivery location
What’s better for outdoor steel — paint, powder coat, or galvanising?
It depends on exposure and appearance requirements:
- Galvanising is often best for maximum long-term corrosion protection outdoors.
- Powder coating is great when colour and appearance matter, with good durability for general exposure.
- Paint systems are ideal when you need an architectural finish or a specified coating system (often used on visible steelwork and projects requiring a particular look).
Can you paint aluminium?
Yes — painting aluminium is common, but it needs the correct surface preparation and compatible primer/topcoat system for reliable adhesion and durability. We can coordinate this through our finishing partners.