Behind the Scenes: How We Powder Coat Aluminium and Steel Fencing

When you look at a freshly powder-coated fence, you see the colour and smooth finish. But achieving a high-quality, durable finish involves much more than simply spraying powder onto metal.

A large part of the work happens before the powder is even applied.

From preparing and treating the metal through to powder application and oven curing, each stage plays a part in creating a finish designed to look great and stand up to outdoor conditions.

Here’s a look behind the scenes at the process.

Step 1: Cleaning & Preparing the Metal

Good powder coating starts with good preparation.

Before aluminium or steel fencing can be coated, the surface needs to be properly cleaned. Oils, dirt, fabrication residue, oxidation and other contaminants can affect how well the powder bonds to the metal.

Our fencing goes through chemical cleaning and rinse stages to remove these contaminants and prepare the surface for treatment.

Think of it like painting a wall - the quality of the finished job depends heavily on how well the surface underneath has been prepared.

Step 2: Pretreating Aluminium & Steel

Aluminium and steel behave differently, so they require different surface treatments.

Aluminium naturally develops an oxide layer. The pretreatment process cleans and conditions the surface before a conversion treatment is applied, helping the powder coating bond effectively and improving corrosion resistance.

Steel has a different challenge: rust. Its treatment can include cleaning and removing oxidation, followed by a phosphate or other conversion treatment to prepare the surface for coating.

Between treatments, the fencing is thoroughly rinsed to prevent chemicals or contamination from being carried from one stage to the next.

These preparation stages create the foundation underneath the finished powder coating.

Step 3: Drying & Powder Application

Once treated and rinsed, the fencing needs to be completely dry before powder can be applied.

The fence components are then hung and electrically grounded while specialised spray guns apply a fine, dry powder.

The powder particles receive an electrostatic charge, which attracts them to the grounded metal and helps create consistent coverage across the fencing.

Unlike traditional wet paint, there is no liquid paint involved — the colour starts as a fine powder.

Step 4: Curing in the Oven

Once coated, the fencing enters the curing oven.

Heat causes the powder to melt, flow and chemically cure into a continuous coating across the metal.

Correct curing is an important part of the process. Different products can heat at different rates — a heavy steel component, for example, behaves differently from a lightweight aluminium rail.

The coating therefore needs to reach the appropriate curing conditions to develop its intended finish and performance.

Step 5: Cooling & Quality Inspection

After curing, the fencing leaves the oven and is allowed to cool.

The finished coating is then checked for appearance, coverage and overall finish before the product moves to the next stage.

The result is the smooth, durable powder-coated surface you see on the finished fence.

The Quality You Don't See Matters

Customers naturally notice the colour and appearance of their fence, but some of the most important work happens long before the finished product reaches them.

Preparation. Pretreatment. Powder application. Curing. Quality checks.

Each stage contributes to the finished product.

So when we talk about the quality of a powder-coated fence, we're talking about much more than its colour — we're talking about the complete process behind the finish.