uPVC window spraying is one of those services that showed up out of nowhere, got popular fast, and then immediately got buried under a fog of nonsense. Half the internet swears it’s the cheapest way to drag a tired house into the current decade. The other half insists it’ll peel off in a year and you’ll have ruined perfectly good windows.
Both sides are partly right. That’s the annoying part.
So here’s the version nobody bothers to write down: what the service actually is, what it really costs, which colours work, and how long it genuinely lasts before it starts going wrong.
So What Is uPVC Window Spraying, Actually?
It’s not “painting your windows.” If you grab a tin of gloss from a hardware shop and slap it on a plastic frame, you’ll get a sticky, peeling mess within months. uPVC is a non-porous, low-surface-energy plastic — paint has almost nothing to grip onto.
Proper uPVC spraying is a coating system, not a paint job:
- Deep clean and degrease — silicone, cooking grease, and old cleaning product residue all have to go, or nothing sticks.
- Abrading — the surface gets scuffed with a fine abrasive pad or light sanding to give the coating a mechanical key.
- Adhesion primer — this is the bit the DIY videos skip.
- Two to three colour coats — typically a two-pack polyurethane or a specialist acrylic, sprayed rather than brushed.
- Cure — which takes days, not hours. It keeps hardening for weeks.
Skip any of those steps and you’ve bought yourself a temporary job that looks great for eight months.
The “You Can’t Paint Plastic” Thing Is Mostly Convenience
This line gets repeated constantly, usually by people selling replacement windows. The real reason it’s “not allowed” is warranty admin, not chemistry.
What actually happens: coating a frame voids the frame finish warranty. That’s it. A warranty on the surface of the plastic. It usually doesn’t touch the glazing unit warranty, the hardware, or the installation. The window won’t fall apart. Nobody is coming to check.
The genuine reasons not to do it are narrower than people claim: dark colours on sun-facing frames can cause heat-related movement, and a badly prepped job will fail. Both are manageable if you know about them going in.
What uPVC Window Spraying Actually Costs
Prices swing wildly because “spraying a window” can mean anything from a two-minute rattle-can job to a fully masked, primed, three-coat system with hardware removed.
The DIY Route
A decent kit — adhesion primer, topcoat, a spray gun or quality aerosol, masking film and tape — lands somewhere around $80–$200. That covers a handful of windows if you’re careful. Budget for a proper respirator too, because two-pack coatings are not something you want in your lungs.
The Professional Route
Realistic ranges, in broad terms:
- Per window frame: roughly $50–$120
- A door: $120–$250
- Whole house (8–10 windows): $600–$1,500
- Full exterior package (windows, doors, sills, trims): $1,500–$3,000+
What pushes the number up: how many opening lights there are, how much masking is needed, whether frames need repairs first, whether the colour is going darker (easier) or lighter (more coats), and how much access is a pain.
What pushes it down: single-storey properties, simple square frames, and booking during a quiet season.
Colours: What Works and What Bites Back
You can get almost any colour mixed. Whether you should is a different question.
- White going grey, black, or anthracite: the classic job. Easiest, best-looking, most durable result.
- Dark going white or cream: doable, but it needs serious primer and more coats. Expect to pay more and accept a slightly softer finish.
- Woodgrain effects: spraying gives you a flat colour. If you want a fake timber grain, that’s a wrap or film job, not spray.
- Metallics and heavy gloss: every tiny imperfection in the frame shows. Satin and matte hide a world of sins.
Standard colour reference codes (the RAL chart) are what most sprayers work from, so you can match a front door, garage door, or gutter in one go. That’s half the appeal — getting the whole exterior to agree with itself without replacing anything.
The Heat Problem Nobody Mentions
uPVC expands and contracts a lot with temperature. A white frame sprayed near-black absorbs far more solar heat than it was designed to handle. On a sun-blasted elevation in a warm climate, that can mean warped sashes, stiff locks, and seals that give up early.
The workaround is simple: go for mid-tones rather than the darkest blacks on sun-facing walls, or accept a shorter lifespan on those specific frames. Sprayers who know what they’re doing will flag this. Ones who just want the job won’t.
Durability: Honest Numbers
A properly prepped, professionally applied coating on a sheltered frame: 8–12 years before it needs attention. That’s a realistic figure, not a sales figure.
Badly prepped, or DIY with no primer: 1–3 years, and it usually fails at the edges, corners, and anywhere a silicone bead used to sit.
Common failure points:
- Silicone contamination — leftover sealant residue kills adhesion stone dead.
- Rushed cure — windows closed too soon, coating welded to itself forever.
- Cold or damp conditions — coating applied below the recommended temperature never fully cures.
- Movement points — hinges, handles, and anywhere the frame flexes.
- Drips and runs — cosmetically annoying and a reliable sign of a rushed job.
Touch-ups are possible but never invisible. Once a coating fails in one spot, water gets behind it and travels.
What a Proper Job Looks Like (So You Can Spot a Hack)
- Everything degreased and cleaned — not just wiped with a cloth.
- Glass, gaskets, handles, and hinges masked or removed.
- Adhesion primer applied and left to flash off properly.
- Multiple thin coats, not one thick one.
- Doors and windows left open until the coating hardens enough not to stick.
- Clear instructions on how long before you can close and lock things again.
If a quote doesn’t mention primer, masking, or curing time, you’re not talking to someone who’s going to do it properly — no matter how good the price looks.
The Bottom Line
uPVC window spraying is a genuinely practical workaround for a house full of frames stuck in 1990s white. It costs a fraction of replacement, it’s done in a day or two, and a good job lasts a decade.
It’s also a service with a huge gap between the best and worst operators, almost no meaningful regulation, and a warranty story engineered to scare you off before you ask questions. Do your homework, expect to pay for prep, and don’t pick your colour purely from a sun-facing wall.
That’s the whole thing. It’s not magic and it’s not a scam — it’s a coating system that lives or dies on how much time someone spends before the spray gun comes out.