TL;DR: A tin of Bunnings or Dulux exterior paint bought off the shelf isn't backed by a system warranty, and works best on a roof that's already sound and just needs a colour or UV refresh. A supplied and professionally matched system, such as Roof Protect (10-year Roof Refresh through to 15 or 20-year Roof Protect) or Dulux's own Acratex Roofing range, pairs a substrate-specific primer with a full coating build and a stated warranty, built for bare, aged, or rusted roofs.
A tin of retail exterior paint works fine on a roof that's already sound and just needs a colour or UV refresh, but it isn't sold with a system warranty attached and isn't built to fix bare tile, rust, or failed adhesion on its own. A supplied system separates primer from topcoat and matches both to the roof's actual condition, which is what earns a stated warranty instead of none at all. The real difference comes down to primer, substrate matching, and whether a warranty is actually attached to the result.
What's the difference between Bunnings or Dulux roof paint and a dedicated roof coating system?
A tin of hardware-store paint is a single product you apply yourself, with no system warranty attached, while a dedicated system is a supplied build with primer, topcoat, and a stated warranty. Bunnings' shelf range and a straight tin of Dulux exterior paint are general-purpose products, useful for cosmetic recoats where the existing coating is still bonded, but sold without any multi-year warranty behind the finished job.
Dulux does offer a 15-year warranty through its Acratex Roofing range, though that's a professionally supplied and applied system, not a tin off the shelf. Roof Protect works the same way: a bonding or rust-inhibiting primer matched to the substrate, then a membrane topcoat carrying a 15-year or 20-year warranty. The gap isn't paint quality, it's whether a warranted system sits behind the product or not.
| Feature | Retail shelf paint (DIY tin) | Roof Refresh | Roof Protect |
|---|---|---|---|
| Best for | Sound roofs needing a colour or UV top-up | Sound, previously coated roofs | Bare, aged, rusted, or damaged roofs |
| Primer included | Not typically, sold separately if at all | Usually not needed | Yes, matched to substrate |
| System warranty | None attached to a DIY tin purchase | 10 years | 15-year or 20-year tiers |
| Application | DIY or general exterior painter | Roof-specific recoat | Full primer-and-membrane system |
Is Bunnings or Dulux roof paint good enough for tile or metal roofs?
It depends entirely on the roof's current condition, not the roof material itself. A tile or metal roof with intact, bonded paint and no bare patches can often take a retail topcoat and get a reasonable cosmetic result. A tile roof with bare concrete or terracotta needs a bonding primer such as Oz Primer first, and a metal roof with active rust needs Rust Inhibitor Primer, not a general adhesion primer, since a standard metal primer isn't designed to go over rust. Skipping the correct primer is the most common reason a repaint looks fine for a season, then starts lifting.
Do Bunnings and Dulux roof paints need a separate primer?
Most retail roof paints assume the substrate is already sound, so they don't automatically build in a primer stage the way a dedicated system does. If your roof shows chalking, bare concrete, exposed terracotta, or rust bleed, adding a compatible primer before any topcoat, retail or otherwise, is what determines whether the job lasts. The Thinking Paint Roof Protection Method checks this first, confirming the surface can bond before price or brand enter the decision.
What roof paint colours can I get if I want something like a Dulux shade?
Colour choice isn't locked to any one brand. Roof Refresh and Roof Protect are available in a full range of tints, including lighter, more reflective shades that behave the same way any light-coloured roof paint does when it comes to heat. If you're trying to match or replace a specific retail colour, Thinking Paint's visualiser tool lets you preview shades on your own roof before ordering, rather than guessing from a paint chip.
How do I know which option my roof actually needs?
Start with condition, not price. A roof with sound, bonded paint and no bare patches is a fair candidate for a retail topcoat or Roof Refresh. A roof with any bare substrate, rust, or failed adhesion needs the primer and membrane build-up in Roof Protect, because a topcoat alone has nothing solid to bond to.
Our Roof Protection Method works through surface type, condition, primer needs, required lifespan, and colour in that order, which is also covered in more depth in our comparison of Roof Refresh versus Roof Protect. Getting this sequence right the first time avoids paying twice.
FAQ
Q: Can I use Bunnings paint on a Colorbond roof? A: You can, if the existing coating is sound and there's no rust or bare steel. Any active rust needs Rust Inhibitor Primer first, not a shelf topcoat, so check the surface condition before assuming a straight coat will hold.
Q: Is Dulux roof paint the same as a full roof restoration system? A: A straight tin isn't. Dulux does sell a professional system, Acratex Roofing, with a 15-year warranty, but that's a supplied and professionally applied build, not a can bought off the shelf. Roof Protect works the same way: a substrate-matched primer plus a membrane topcoat under a 15-year or 20-year warranty.
Q: Do I need primer with a retail roof paint? A: If the roof has bare tile, terracotta, or active rust, yes. A DIY tin is built to go over an already-sound surface, so any bare or damaged section still needs a compatible primer regardless of which topcoat brand you choose.
Q: How long does a hardware-store roof paint last compared to Roof Protect? A: A DIY tin generally has no system warranty attached at all, while Roof Protect is rated for 15 or 20 years because it includes the primer and preparation stages that qualify it for a stated warranty. Even Dulux's own professional roofing system only reaches 15 years when a certified applicator installs it as a complete build.
Q: Will a DIY roof paint void my warranty if my roof actually needed Roof Protect? A: There's no system warranty to void with a DIY tin in the first place, but the practical result is the same either way: a topcoat over bare or damaged substrate tends to fail early, often within a season.
The right choice between a retail roof paint and a dedicated system comes down to your roof's condition, not the brand on the tin. The Thinking Paint Roof Protection Method checks surface type, condition, and primer needs before recommending a product, so you're not paying for a repaint twice.
Check our product page before choosing your roof paint, primer, or coating here.