Spray, roll or brush: which method suits which surface

Spray the large repetitive surfaces: ceilings, roofs, fences, palings, and joinery that can be removed and masked. Roll the broad flat areas such as interior walls. Brush anything where the paint has to be worked into a joint, an edge or a corner, which on a weatherboard house is most of it.

Almost every real job uses all three, often on the same wall in the same hour. The method is chosen per surface, not per house, and a painter who only ever reaches for one of them is choosing speed over the finish.

What is each method actually good at?

Spraying is fast and leaves no applicator texture. That is its whole advantage, and it is a real one on doors, joinery, ceilings and profiled metal. Its cost is preparation: everything you are not painting has to be masked, and the amount of masking on a typical house is several hours of work before a drop of paint is applied.

Rolling covers broad flat area quickly with good control and no masking, and it pushes paint into surface texture rather than laying it on top. The trade-off is roller stipple, which is invisible on a wall and obvious on a door.

Brushing is the slowest and the only one that puts paint exactly where you want it and nowhere else. It also works paint into places nothing else reaches: under a weatherboard lap, into end grain, into a gap between a sash and a bead.

Which method suits which surface?

Surface	Best method	Why
Interior ceilings	Spray and back-roll, or roll	Large uninterrupted area, and no one sees it at close range
Interior walls	Roll, brush the cut-ins	Control, no masking, even film build
Doors and joinery	Spray if it can be removed and masked, otherwise brush	Sheen at close range shows every brush mark
Window sashes and reveals	Brush	Cut lines against glass, complex sections
Weatherboards	Spray then back-brush, or brush	Coating must be worked under the lap and into end grain
Roofs	Spray	Large profiled area that a roller cannot follow
Fences and rough-sawn palings	Spray then back-brush	Rough grain has surface a roller skims over
Concrete block and textured render	Roll with a long nap, or spray and back-roll	Paint has to be pushed into the texture, not bridged across it
Balustrades, railings, ironwork	Brush, or spray with heavy masking	Complex shapes with more edge than face

What is back-rolling and back-brushing, and why does it matter?

It means spraying the paint on and then immediately working it with a roller or brush before it starts to set. The spray does the delivery, the roller or brush does the bonding.

This matters because sprayed paint lands on a surface rather than being pushed into it. On smooth, sound, previously painted surfaces that is fine. On rough sawn timber, weathered weatherboards, textured block or anything porous, a sprayed film sits on the high points and bridges the hollows, and it will fail early from those hollows out.

If a quote says the exterior will be sprayed, ask whether it will be back-brushed. On weatherboards the answer should be yes. A sprayed-only exterior is a fast job, not a durable one.

Does spraying use more paint?

Yes. Some is lost as overspray drift, some in the hose and pot at the start and end of each run, and coverage rates are generally heavier. On a house needing 20 to 30 litres in total at $200 to $600 at 2026 prices, the extra material is a modest number compared with the labour it saves on the right surface, and a poor trade on the wrong one.

The bigger cost of spraying is not paint, it is masking. On an occupied house with windows, joinery, decks, plants, a driveway and a neighbour's car on the other side of a narrow boundary, masking properly can take longer than brushing the surface would have.

Can you spray an exterior in Wellington?

Sometimes, and less often than in most of the country. Airless spraying needs still air. Any real breeze carries atomised paint sideways, and the practical limit arrives well before the wind feels strong to a person standing on the ground.

What that means in practice here: exterior spraying happens in the calm windows, usually early in the day, and the crew has to be able to switch to brush and roller when the northerly comes up rather than standing around. It also means the masking has to be genuinely thorough, because paint drift onto a neighbour's car or windows is expensive and entirely avoidable.

Sheltered sites in the valleys and the lee of a hill get far more spraying weather than exposed sites on the harbour edge or the south coast. Two houses ten minutes apart can be completely different propositions.

Where is spraying clearly the right answer?

Roofs, first and foremost. Corrugated and trough-profile sheet is a large area of repeating shape that no roller follows properly, and the finish from a gun is both faster and better. Any roof coating job is a spray job, with the perimeter and flashings cut in by hand.

After that: empty rooms before the flooring goes down, whole ceilings, garage interiors, fences and retaining walls, and joinery that has been taken off and laid flat in a shed. If a door can be lifted off its hinges, sprayed flat and left to harden, it will look better than the same door brushed in place, and it will stay cleaner because dust settles on a horizontal surface rather than running down a vertical one.

When is a brush the only right answer?

The bottom edge of every weatherboard, which is where water sits and where failure starts. End grain at scarf joints and board ends. The gap where a window frame meets the cladding. Anywhere a fixing has been filled. The line where a wall meets a ceiling. Any surface small enough that masking it would take longer than painting it.

On an interior repaint in an occupied house, brush and roller usually beat spray outright, because the occupants keep their furniture, their curtains and their week.

Is it worth hiring a sprayer for a DIY job?

For one room, no. You will spend the hire fee, half a day masking, and another hour cleaning the gun out properly, to do a job a roller finishes in two hours with no cleanup beyond a tray liner.

For a long fence, a large deck of rough palings, or a garage you can empty completely, yes. Those are the jobs where the masking is minimal and the area is large, which is exactly the ratio spraying rewards.

If you want a quote that states which surfaces are sprayed, which are back-brushed and which are hand-finished, that is how we write ours. Ask for one.