Spend ten minutes on any Australian home-renovation forum and you will find the same worry on repeat: fence panels that looked great at the yard, then chalked, faded or flaked at the edges within a couple of summers. The worry is fair: but coating quality is checkable before you buy. You just need to know which questions to ask.
The quick checklist
Ask which standard the coating is applied to. For aluminium fencing, the Australian standard is AS 3715.
Ask for the film thickness. Around 60-80 microns is the commonly quoted architectural benchmark.
Confirm the metal was pre-treated (cleaned, etched and conversion-coated) before the powder went on.
Check the extrusion wall thickness, not just the panel price.
Get the warranty in writing, including any coastal or wash-down conditions.
What powder coating actually is
Powder coating is a dry finish, not a wet paint. A fine polymer powder (for outdoor fencing it should be an exterior architectural-grade polyester) is given an electrostatic charge, sprayed onto the earthed aluminium so it clings evenly to every surface, then oven-cured into a single continuous skin that is harder, thicker and more uniform than brushed or sprayed paint.
Done properly, it is a superb finish for South East Queensland: UV-stable, chip-resistant and happy with an occasional wash. But “powder coated” on its own tells you almost nothing. The result depends on the grade of powder, the surface preparation underneath it, the film thickness and the cure: and cheap panels cut corners on the two you cannot see: preparation and thickness.
The Australian standards worth asking about
Two Standards Australia documents cover thermoset powder coating for building products:
AS 3715 (Metal finishing) Thermoset powder coatings for architectural applications of aluminium and aluminium alloys. It applies to aluminium fence panels, posts and gates, setting out test procedures and performance requirements; the current edition was published in 2025, replacing the 2002 version.
AS 4506 (Metal finishing) Thermoset powder coatings. It covers powder coating on other metal substrates such as steel, most recently revised in 2024.
You do not need to memorise clause numbers. The point is simpler: a quality supplier can tell you the powder is an exterior architectural grade and that the applicator coats to AS 3715. If “what standard is the coating done to?” draws a blank look, that is your first data point.
The buyer’s checklist
Here is the whole inspection in one table: run any panel, ours included, through these seven checks:
| Check | What good looks like | Red flag |
|---|---|---|
| Coating standard | Supplier can name the standard (AS 3715 for aluminium) and the powder grade | “It’s powder coated” is the entire answer |
| Film thickness | A stated figure, typically around 60-80 microns for architectural work | No figure available anywhere |
| Pre-treatment | Degrease, etch and conversion coating before powder | Pre-treatment never mentioned |
| Surface finish | Smooth, even colour and gloss across the face | Heavy orange peel, patchy gloss, specks or pinholes |
| Edges and welds | Fully coated, cleanly finished corners, ends and welds | Thin, shiny edges or bare metal at cut ends |
| Wall thickness | Extrusion wall thickness published; panel feels rigid | No figures; slats flex and dent under thumb pressure |
| Warranty | Written coating and product warranty with plain terms | Verbal promises, or conditions nobody can produce |
No single row proves a panel is good or bad on its own: but two or three red flags together tell a very clear story.
Coating thickness: where cheap panels cut corners
Powder coating is measured in microns (thousandths of a millimetre). For exterior architectural work, around 60-80 microns is the benchmark range most reputable applicators and powder makers quote. Below that, the film has less UV resistance in reserve, so colour fade and chalking (that dusty white bloom on old finishes) arrive years early.
Edges and corners matter most. Powder naturally pulls away from sharp edges during curing, so those spots carry the thinnest film: which is why cheap panels fail there first. Look along the cut ends and corners of a sample in good light: glassy, translucent edges or a different sheen to the face mean thin film exactly where the weather attacks first. A supplier who knows their applicator will have a spec sheet with the film build on it: ask, and note the reaction.
Pre-treatment: the step you cannot see
Before any powder goes on, quality aluminium is degreased, rinsed, etched and given a conversion coating: a chemical layer (chromate or a modern chrome-free equivalent) that bonds to the bare metal and gives the powder something to grip. It adds nothing to the look at handover: precisely why the cheapest imported panels skimp on it.
The failure shows up later: powder that blisters and loses adhesion, or fine worm-like corrosion tracks creeping under the film from cut edges and screw holes: especially in salty air. You cannot inspect pre-treatment with your eyes, so ask the direct question (“what pre-treatment does the coater use?”) and buy from someone local enough to be answerable if the coating fails.
Salt air and coastal SEQ: why durability testing matters
Plenty of South East Queensland fencing lives within a few kilometres of salt water: bayside Brisbane, the Redlands, Moreton Bay and the coastal strips. Aluminium has a head start here: unlike steel it does not rust, thanks to its own protective oxide layer. But the coating still has to survive years of UV and salt to keep its colour and gloss.
Coating systems are proven in accelerated salt-spray and weathering tests, where samples sit in a salt fog chamber for hundreds or thousands of hours: the longer they survive, the better the coastal credentials. If you are near the water, ask whether the coating system is rated for coastal exposure: and give any coastal fence an occasional fresh-water rinse, which most coating warranties expect anyway.
Wall thickness: the fence under the coating
A flawless coating over a flimsy extrusion is still a flimsy fence. Aluminium fence components are extruded with a hollow profile, and the wall thickness of that extrusion (measured in millimetres) decides whether a slat shrugs off a stray football or keeps the dent, and whether a gate stays square for twenty years or sags in five.
Ask for wall thickness in writing and compare like with like: slats, rails and posts each have their own figures, and posts should be the heaviest. If a seller will not publish wall thickness, weight is a rough proxy: pick the panel up. A suspiciously light panel and a suspiciously low price usually share a cause. A fence is a 25-year purchase, and as our aluminium vs timber cost comparison shows, the cheap option you replace early is the expensive one.
Warranty questions to ask before you pay
Warranties are where coating quality gets honest. Five questions to put to any supplier:
How long is the warranty, and is it in writing? Verbal assurances do not survive a change of sales staff.
What exactly does it cover? Film adhesion, colour fade and gloss retention are different promises.
Are there coastal or maintenance conditions? Distance-from-water clauses and wash-down requirements are common: you just want them upfront, not at claim time.
Who actually stands behind it? A local supplier you can phone, or an overseas factory you cannot?
What happens if a panel arrives damaged or fails early? The answer should be a process, not a shrug.
Judge the answers, not just the numbers. A short, clearly written warranty from a supplier ten suburbs away is worth more than a decade-long promise from a webshop with no address.
How FY Fencing’s panels stack up
We would rather hand you the checklist than a sales pitch: so run us through it. Our panels and gates are made to order in powder-coated Black, Monument and White, using exterior architectural-grade polyester over pre-treated aluminium extrusions: and we will happily talk specifics, from powder grade to film build to wall thickness, before you order.
On price: we carry a low-price guarantee: the savings come from selling direct, not from thinner walls or skipped pre-treatment. You can browse panels and gates online, pick up from our Slacks Creek yard, or have them delivered across South East Queensland: see our service areas. Handy DIYers can bolt panels together in a weekend with our step-by-step installation guide, or ask us about professional installation.
Frequently asked questions
What is a good powder coating thickness for aluminium fencing?
Around 60-80 microns is the range commonly quoted for exterior architectural powder coating. Thinner films fade and chalk sooner, with edges and corners failing first. Ask the supplier for the specified film build: a quality supplier will have the figure on hand.
What Australian standard covers powder coated aluminium fencing?
AS 3715 (Metal finishing: Thermoset powder coatings for architectural applications of aluminium and aluminium alloys) covers powder coating on aluminium, with the current edition published in 2025. AS 4506 covers other metal substrates such as steel. For an aluminium fence, AS 3715 is the one to ask about.
Will powder coated aluminium fencing last near the coast?
Yes: aluminium does not rust the way steel does, and a properly pre-treated, well-cured powder coat handles coastal South East Queensland well. Near salt water, ask whether the coating system is rated for coastal exposure and give the fence an occasional fresh-water rinse.
How can I tell if a fence panel is poorly powder coated?
Look for heavy orange peel, patchy gloss, specks or pinholes on the face, and thin, glassy coverage on edges, corners and cut ends. Bare metal at welds or screw holes is a serious warning sign. If the supplier also cannot name a standard, a film thickness or a pre-treatment, walk away.
What warranty should I expect on powder coated fence panels?
Expect a written warranty stating what is covered (adhesion, fade, gloss) and any conditions such as coastal distance or wash-downs. Clarity matters more than length: a plainly written warranty from a local supplier beats a long promise from a seller you cannot reach.
Working out what your fence line needs? Tell us the run and the height and we will quote it, supply-only or installed.
- Brisbane-based supplier
- Aluminium fencing & gates
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