Can I touch up damaged galvanised racking?

Yes — for minor scratches use zinc-rich cold-galv paint. Larger damage means the upright should be re-rated or replaced.

Is galvanised racking food-safe?

Hot-dip galvanised is acceptable for general food storage where direct contact with unwrapped product is avoided. For wash-down or direct-contact zones, stainless steel is preferred.

Can I mix powder-coated and galvanised in one warehouse?

Yes — between separate frames or aisles. Avoid mixing finishes in the same upright frame, as it complicates future inspection records.

Does finish affect AS 4084 compliance?

No — AS 4084 is concerned with structural performance, not finish. But corrosion damage that compromises section thickness will fail an audit.

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Galvanised vs Powder-Coated Pallet Racking

The finish you choose affects lifespan, cost and which environments your racking can survive in. Here's the plain-English finish comparison.

TL;DR

Powder coat is the default for dry warehouses — cheapest, easiest to colour-match.
Hot-dip galvanised is the cold-store and outdoor standard.
Zinc-plated sits between the two on cost and corrosion resistance.
Stainless is reserved for food-grade, washdown and chemical environments.

Key Takeaways

Powder coat costs less but chips, exposing steel to corrosion.
Hot-dip galv is self-healing at scratch sites — best for humid or cold-store environments.
Mixing finishes in one frame is fine structurally but creates inspection complexity.
Touch-up paint on galvanised steel is acceptable for minor abrasions only.
Cold-store buyers should specify galv from day one — retrofitting is expensive.

Reviewed by Matt Gade — QBCC-licensed installer & lead inspector

The four finishes

Finish-by-finish comparison

Finish	Best for	Indicative life	Watch-outs
Powder-coated	Dry warehouse, ambient	10–15 yrs	Chips expose bare steel; touch-up needed
Zinc-plated	Light humidity, indoor	8–12 yrs	Thinner zinc layer than HDG
Hot-dip galvanised	Cold-store, humid, outdoor	20+ yrs	Heavier, costs 30–50% more than powder
Stainless steel	Food-grade, wash-down, chemical	30+ yrs	Premium price; long lead time

Choosing

How to pick a finish

Indoor dry warehouse → powder coat.
Cold storage (≤ 5 °C) → hot-dip galvanised.
Outdoor or canopy storage → hot-dip galvanised.
Food-grade washdown → stainless steel or HDG with wash regime.
Coastal/high-humidity QLD/NSW sites → at minimum zinc-plated, prefer HDG.

Cold-store rule of thumb

Once you're below 5 °C with regular thermal cycling, powder coat will fail at every chip site within 5–7 years. Specify HDG from the outset — retrofitting costs 3–4× the original premium.

Maintenance

Maintaining each finish

Powder coat needs annual touch-up at chip sites. Galvanised steel is largely maintenance-free aside from spot zinc-rich paint at scratches. Stainless requires only periodic wash-down. Whichever finish you choose, document it in your AS 4084 inspection records so corrosion progression is tracked over the life of the system.

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