Zincalume roof vs Colorbond: can you paint it, and should you? (2026)
Yes, you can paint a Zincalume roof. BlueScope makes both Zincalume and Colorbond steel. Its overpainting bulletin TB-2 (August 2022) says Zincalume "can be successfully overpainted" once it is washed and any rusted spots are brushed back and primed. The catch is what you end up with. Colorbond is, for most products, the same kind of coated steel with a primer and paint baked on in a factory. Painting your roof gives you the colour and a fresh protective coat. It does not give you that factory finish.
At R&R Restorations, painting a Zincalume roof is part of our metal roof restoration on the Gold Coast. We also work across Brisbane, Logan, Tweed Heads and the Northern Rivers. We fix the screws, the rust and the lifted sheets first, then prime and recoat in the colour you choose. Our published guide for a whole metal roof is $5,000 to $12,000.
A tired Zincalume roof is easy to spot from the street. The bright silver has gone a flat grey, there are orange freckles around the screws, and one sheet rattles whenever the wind gets up. The grey is normal. The freckles and the rattle are the parts worth fixing.
In summary
- Zincalume is bare steel with an aluminium, zinc and magnesium coating. Colorbond is, for most products, the same kind of coated steel with a baked primer and paint on top.
- You can paint Zincalume. BlueScope's bulletin sets out the preparation: wash it, brush rust back without stripping the metal coating, and spot prime with a zinc rich etch primer.
- A painted roof is not Colorbond. BlueScope says air dried paints weather differently from its baked finish, and that overpainting voids any BlueScope warranty.
- Paint a Zincalume roof when the sheets are sound and you want colour, or rust is starting at screws and laps. Replace sheets that have rusted through.
- Our published guide is $5,000 to $12,000 for a whole metal roof restoration, or $350 to $1,500 for a focused repair.
What is the difference between Zincalume and Colorbond?
Zincalume and Colorbond are both BlueScope steel, and most Colorbond starts life as the same metallic coated steel. The difference is the paint. Zincalume is left bare, so its silver finish is the metal coating itself. Colorbond adds a pretreatment, a baked primer and a baked topcoat in the factory.
BlueScope describes Zincalume (checked 2 November 2026) as steel with an aluminium, zinc and magnesium alloy coating. It was developed in 1976, and the current version with Activate technology arrived in 2013. Activate is BlueScope's name for the coating technology designed to slow corrosion. Colorbond's own technology page (checked 27 October 2026) lists five layers: steel, metallic coating, pretreatment, baked primer and baked topcoat, in 22 core colours.
| Zincalume | Colorbond | |
|---|---|---|
| What it is | Steel with a bare aluminium, zinc and magnesium coating | For most products, the same kind of coated steel plus a factory baked primer and topcoat |
| Look | Bright silver when new, weathering to a duller grey | Solid colour, 22 core colours |
| Sheet price at one Gold Coast supplier* | $18.50 per lineal metre | $19.50 per lineal metre |
| Where wear shows first | Rust at screws and sheet laps | Fading and chalking of the paint, then rust at the same spots |
| Can it be painted later? | Yes, after washing and spot priming any rust (BlueScope TB-2) | Yes, after cleaning and preparation (BlueScope TB-2) |
| What our metal roof restoration covers | Clean, rust treatment, failed screws replaced, sheets refixed, primed and recoated | The same |
*Queensland Roofing Warehouse, Varsity Lakes, corrugated sheet, prices checked 2 November 2026. Supply only, not an installed price.
Look at that price row again. At that supplier, choosing colour at the factory adds about a dollar a metre to a corrugated sheet. Adding colour once the roof is up means a whole roof painting job.
Is Zincalume or Colorbond better for a house roof?
Neither is better in every case. Choose Zincalume for the classic silver look at a slightly lower sheet price, and Colorbond for a factory colour that keeps its finish without repainting. If you are buying new sheets anyway and want colour, Colorbond is usually the smarter buy.
Here is how we would think about it as a homeowner:
- You love the silver look. Zincalume suits a Queenslander, a farmhouse look or a modern build. Expect it to dull from bright silver to soft grey as it weathers.
- You want a colour that matches the house. Pick Colorbond when the roof is new. Painting Zincalume later works, but then you are paying for a whole job instead of a small upgrade on the sheets.
- You already have a Zincalume roof. Then the real choice is between leaving it bare, repairing it, or painting it. Replacing sound sheets just to get colour is rarely the best use of the money.
We do not install new roofs. If you are building or re-roofing, ask your roofer about profiles such as Custom Orb, Trimdek or Klip-Lok. Our job starts once a metal roof is on and has started to show its age.
Can you paint a Zincalume roof?
Yes. BlueScope's bulletin TB-2 (August 2022, revision 14) says Zincalume steel "can be successfully overpainted". It sets out one preparation for sound metal and another for rusted spots. It also recommends asking a reputable paint supplier which paint suits the roof and its environment.
This is BlueScope's preparation for Zincalume, from Table 2 of that bulletin:
| Roof condition | BlueScope's recommended preparation |
|---|---|
| New or evenly weathered surface | Wash with household detergent and water using a mop or soft nylon broom, rinse with fresh water and let it dry |
| Damaged areas with rust showing | Remove the rust with a stiff nylon brush, taking care to remove only the corrosion and not the metal coating. Sweep away loose particles, then apply a thin zinc rich etch primer |
Paint makers then set the system on top. Dulux's metal roof guide (checked 27 October 2026) puts a primer for zinc and aluminium surfaces on new, uncoated Zincalume, followed by two coats of roof membrane. A roof membrane is a thick, flexible roof paint that forms a protective film. That is why we prime before we recoat. New Zincalume even leaves the factory with a thin clear resin on its surface, added to stop fingerprint marks during installation. Paint needs the right primer to grip that.
Three things in the bulletin are worth knowing before you book anyone:
- Painted is not the same as Colorbond. BlueScope says air dried paints weather differently from its oven baked finish. The baked finish is often the more durable of the two. Plan on a painted roof needing a recoat sooner than factory Colorbond would.
- Overpainting ends the BlueScope warranty. The bulletin says overpainting Colorbond, Zincalume or zinc-coated steel "will void any warranties issued by BlueScope". On a near-new roof, check your BlueScope paperwork before you paint it just to change the colour.
- No steel wool. BlueScope warns that steel wool leaves tiny metal particles that rust and stain the sheets. A cheap job that "rubs it back" with the wrong pad can create the rust it was meant to stop.
Should you paint your Zincalume roof or leave it bare?
Leave a Zincalume roof bare if it is evenly grey, the screws are tight and nothing is rusting. Paint it when you want colour, or when rust is starting at screws and laps and the sheets around it are still solid. Replace sheets once rust has eaten through them.
Dull grey on its own is not damage. It is normal weathering, which BlueScope's bulletin calls an "evenly weathered surface" and treats as ready for paint after a wash. The warning signs are different: rust spots around screws and laps, rusted or backed-out screws, and sheets that lift or rattle in the wind. Close to the coast, salt air speeds all of that up. The earlier the rust is treated, the more of the roof can be kept.
| What you can see from the ground | What it usually means | What we would recommend |
|---|---|---|
| Even dull grey, no rust, sheets sitting flat | Normal weathering | Leave it bare, or paint it only if you want a colour |
| Rusty or loose screws, a sheet lifting | Fixing failure, often the cause of a leak | A focused repair, $350 to $1,500 if that is all the roof needs |
| Rust spots at screws and laps across the roof | Corrosion starting while the sheets are still sound | A metal roof restoration: treat, repair, prime and recoat |
| Holes, or rust that has eaten through sheets across much of the roof | Sheets past saving | Replace those sheets or the roof; paint will not hold |
If you are painting anyway and summer heat bothers you, read our guide to heat reflective roof paint before you choose a colour. Not sure your roof is still worth keeping? Our guide on whether to restore or replace your roof covers that call in depth.
What does a Zincalume roof restoration involve?
A Zincalume roof restoration repairs the roof first and paints it last. We clean the whole roof and check every sheet, screw and flashing. Then we treat the rust, replace failed screws and refix lifted sheets, and finally prime and recoat the roof in the colour you choose.
Here is our process, step by step:
- Clean and check. We clean the whole roof with the method matched to its material and condition. Then we check every sheet, screw and flashing. Cleaning exposes faults that dirt was hiding.
- Treat the rust. Rusted spots are cleaned back and treated before they spread, in line with the coating system we are using.
- Fix what holds the roof down. Failed and rusted screws are replaced, lifted sheets are refixed and worn flashings are repaired. On Zincalume, screw choice matters: BlueScope says stainless steel fasteners must not be used with it, which our guide to metal roof screws explains.
- Prime and recoat. The roof is primed for its surface and recoated in the colour you choose.
Two practical notes. If your roof fills a drinking water tank, tell us when you enquire. BlueScope's bulletin says the paint supplier should confirm the system suits drinking water collection, and the tank may need disconnecting while the work is done. And painting is not a leak fix on its own. Metal roof leaks usually come from a failed screw, a lifted sheet or a worn flashing. We fix that cause before any paint goes on.
If your roof is already Colorbond rather than bare Zincalume, the preparation is different. Our guide to painting a Colorbond roof covers that job.
How much does it cost to paint a Zincalume roof?
Our published guide puts a metal roof restoration at $5,000 to $12,000, depending on how much surface preparation and rust treatment the roof needs. A focused repair, such as replacing failed screws or refixing a few sheets, is commonly $350 to $1,500 if that is all the roof needs.
| Scope | Our published guide | Best for |
|---|---|---|
| Focused metal roof repair | $350 to $1,500 | A sound bare roof with a few failed screws or lifted sheets |
| Metal roof restoration (clean, rust treatment, screws, sheets, prime and recoat) | $5,000 to $12,000 | A sound roof with spreading rust, or an owner who wants colour |
Source: our metal roof restoration service page, checked 2 November 2026. These are budget guides in Australian dollars, not fixed prices. We quote after assessing your roof.
The price moves with roof size, pitch, height, access and how much rust and repair work there is. A small, low roof that only needs colour sits at the lower end. A steep two-storey roof near the beach with rust along every lap sits higher. Our quote sets out the areas, repairs, preparation and finish included, with any exclusions made clear. That lets you compare quotes line by line rather than on the total.
Is R&R Restorations right for you?
We are a good fit if your Zincalume or Colorbond roof is still sound and you want it repaired properly, then painted in a colour you like. We cover the Gold Coast, Brisbane, Logan, Tweed Heads and the Northern Rivers. R&R Restorations is owner-operated by Alex Rowe, and the same business that quotes your roof does the work.
Rodney had an old rusty roof. In his Google review of 22 April 2024 (spelling tidied) he wrote that Alex:
"turned up on time and did an awesome job, turned my old rusty roof to look brand new."
That is one customer's result on his roof, not a promise that every rusty roof can be saved.
We are not the right choice if:
- You want a new roof. We do not list re-roofing among our services. If you are building or replacing the whole roof, talk to a roofer who installs, and consider Colorbond if you want colour.
- The sheets have rusted through across most of the roof. Paint will not hold on steel that is gone. We will tell you that at the assessment rather than coat over it.
- Your roof is nearly new and you only want a different colour. Painting it ends the BlueScope warranty. Check your paperwork first.
- You want the lowest price for a quick spray. We do not paint a roof we have not prepared.
Find out what your Zincalume roof needs
Start with the roof, not the paint chart. Tell us your suburb, that the roof is Zincalume, and what you have noticed: rust at the screws, a rattling sheet or a leak. Photos taken safely from the ground help. Call us on 0422 630 075 or request a metal roof restoration quote. We will tell you whether it needs a repair, a full roof restoration or nothing at all.
Frequently asked questions
Does Zincalume rust?
Yes, eventually, and usually at the weak spots first: around screws and along sheet laps. Salt air speeds it up. Caught while the sheets are sound, that rust can be treated as part of a metal roof restoration.
Is it normal for a Zincalume roof to go dull?
Yes. New Zincalume is bright silver and weathers to an even, duller grey. BlueScope's bulletin treats an evenly weathered surface as ready for paint after a wash. Dullness alone is not a reason to paint or replace the roof.
What primer goes on a Zincalume roof?
One made for zinc and aluminium coated steel. BlueScope's bulletin calls for a zinc rich etch primer on rusted spots. Dulux's metal roof guide lists a zinc metal primer for new, uncoated Zincalume. We prime every metal roof before we recoat it.
Do the screws need replacing before painting?
Failed and rusted screws do, because paint will not seal a loose screw or a perished washer. We replace them as part of every metal roof restoration. Replacement screws must suit Zincalume, and BlueScope rules out stainless steel.
Can I paint a Zincalume roof myself?
We would not recommend it. Metal roofs are slippery, and a fall from roof height is serious. The preparation is also the part that decides whether the paint stays on. Send us photos taken from the ground and we can tell you what the roof needs.