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How to Paint a Bathroom in NZ: Beating Steam, Moisture and Mould
- amigospainters
- Aug 4
- 6 min read
To paint a bathroom in NZ, clean and dry the walls, treat any mould, then sand, fill and spot prime. Use a moisture resistant kitchen and bathroom paint in a low sheen or semi gloss finish. Ventilate well while you work and let each coat cure hard before running a hot shower.
Your bathroom is the hardest working room in the house, and the paint knows it. Steam from the shower, splashes around the basin, and Auckland's damp air all gang up on the walls.
So if your last paint job is peeling, bubbling, or growing black spots in the corners, you probably didn't do anything wrong. You just used the wrong paint or skipped a step in the prep. The good news is that learning how to paint a bathroom properly isn't hard, and once you get the paint, prep and ventilation right, the finish shrugs off moisture for years.
Why is painting a bathroom different from any other room?
A bedroom wall just has to look good. A bathroom wall has to survive. Every hot shower fills the room with steam that settles on the walls and ceiling, and if the paint can't cope, moisture soaks in and mould moves in behind it.
This isn't a rare problem in New Zealand. Around 16.5% of New Zealanders live in a home with visible mould, and BRANZ research has found close to half of NZ houses show some damp or mould. Stats NZ has the numbers. Bathrooms are usually where it all starts.
Standard interior paint is porous. It drinks up moisture, stays damp, and hands mould the exact conditions it loves. That's why a normal wall paint fails fast in a bathroom, no matter how neatly you rolled it on.
What paint should you use in an NZ bathroom?
This is the part that matters most, so don't cheap out here. You want a paint made specifically for kitchens and bathrooms, not a general interior paint. Two options cover most NZ bathrooms:
Resene SpaceCote Low Sheen Kitchen & Bathroom, which builds anti mould and anti bacterial protection right into the paint film. See the Resene kitchen and bathroom range.
Dulux Wash&Wear +PLUS Kitchen & Bathroom, formulated for damp rooms with a mould inhibitor and a long guarantee against mould growth.
Both are washable, moisture resistant, and designed to stop steam soaking into the wall in the first place.
For the walls, a low sheen or semi gloss finish is the sweet spot. It's tough, it wipes clean, and the slight sheen helps moisture bead off instead of sinking in. Dead flat matte looks lovely but it's a mould magnet in a wet room. If you want the full rundown on sheens, we cover it in our guide to choosing the right paint finish.
For the ceiling, use a flat, bathroom specific ceiling paint. The ceiling cops the most steam of any surface in the room, so a mould resistant ceiling paint is worth every cent.
How do you paint a bathroom, step by step?
Here's the process from start to finish. Don't rush the prep, because that's where most bathroom paint jobs are won or lost. Our full wall prep guide goes deeper, but this is the bathroom version.
Clear the room and protect surfaces. Take everything off the walls, mask around the mirror, taps and trim, and drop sheet the floor and vanity.
Kill any mould first. Wash affected areas with a proper mould killer, not just bleach, which lifts the colour but leaves the roots behind. Let it dry completely. Painting over live mould only hides it for a month.
Clean the walls. Wipe everything down with sugar soap to strip off soap scum, body oils and grime. Paint won't grip a greasy wall.
Sand and fill. Sand any glossy areas so the new paint can bite, fill holes and cracks, then sand those smooth once they're dry.
Prime where needed. Spot prime bare patches, fresh filler and stains with a suitable primer or sealer so they don't flash through the topcoat.
Cut in and roll the first coat. Cut around the edges with a brush, then roll the main walls. Keep the fan running or a window open, and keep a wet edge as you go.
Recoat and cure. Let the first coat dry fully, apply a second coat, then leave it to cure hard before you run a hot shower. Rushing steam onto fresh paint is a classic mistake.
Give each coat the full drying time on the tin, and don't skip that final cure. If you're not sure whether bare or patched areas need sealing first, our primer and undercoat guide explains when priming is non negotiable.
How do you stop mould coming back after painting?
Paint alone won't win the war against mould. Ventilation is the other half of the job, and honestly it's the bigger half.
Run the extractor fan during every shower and leave it going for 15 to 20 minutes afterwards. If your bathroom doesn't have a fan, an open window helps, but a good extractor fan is the single best upgrade for a damp bathroom.
Wipe down the walls and ceiling now and then too, especially in winter when condensation is at its worst. A quick wipe stops soap scum and moisture building into a mould problem.
If mould keeps returning on the outside of the house as well, that's a sign of a bigger damp issue worth sorting. We cover that in our guide to exterior mould on Auckland homes.
Should you paint the bathroom yourself or hire a painter?
A small bathroom is one of the more DIY friendly rooms, so plenty of people tackle it over a weekend. Whether that's the right call comes down to the state of the walls.
Painting it yourself makes sense if:
The walls are sound, with no major mould, water damage or flaking.
You're comfortable with prep, cutting in and working in a tight space.
You just want a colour refresh, not a repair job.
It's worth calling a painter if:
There's persistent mould, peeling, or signs of a moisture problem behind the paint.
The old paint is oil based and needs the right prep before it can be recoated.
You want a flawless finish around the tiles, vanity and trim without the fuss.
Our take on painting bathrooms
Most failed bathroom paint jobs we get called out to fix have the same two causes: the wrong paint, and mould that was painted over instead of killed. Sort those two things out and a bathroom repaint lasts years, not months.
We'll be honest with you. If your bathroom is small and the walls are in good shape, you can absolutely do this yourself and save the money. Just buy the proper kitchen and bathroom paint and don't skip the mould treatment.
Where we earn our keep is the trickier jobs: bathrooms with real damp problems, dodgy old paint that needs stripping, or a finish you want looking sharp for a sale or a rental. That's the work worth handing over.
Bathroom Painting Frequently Asked Questions
What kind of paint is best for a bathroom in NZ?
A dedicated kitchen and bathroom paint like Resene SpaceCote Low Sheen Kitchen & Bathroom or Dulux Wash&Wear +PLUS. These are moisture resistant, washable, and have mould inhibitors built in. A standard interior wall paint simply won't last in a wet room.
Can I use normal paint in a bathroom?
You can, but it won't last. Standard interior paint is porous, so it soaks up steam, stays damp and grows mould. It might look fine for a few months, then you'll be repainting. Bathroom specific paint costs a little more and saves you doing the job twice.
What finish should bathroom walls be?
Low sheen or semi gloss. The slight sheen helps moisture bead off and makes the walls easy to wipe clean. Avoid dead flat matte on bathroom walls, since it holds moisture and mould. The ceiling should get a flat, bathroom specific ceiling paint.
How do I stop mould coming back after I paint?
Kill the existing mould before you paint, use a mould resistant paint, then keep the room ventilated. Run the extractor fan during and after every shower, and wipe down damp surfaces in winter. Ventilation matters just as much as the paint.
Do I need to prime bathroom walls before painting?
Not always. If the walls are sound and already painted, a good clean and sand is usually enough. Prime bare plaster, fresh filler, stains or patchy areas so they don't show through. Our guide to priming explains when it's essential.
How long should I wait before showering in a freshly painted bathroom?
Give the final coat as long as you can, ideally a couple of days, before exposing it to hot steam. Paint needs time to cure hard, not just feel dry to the touch. Running a hot shower too soon can leave the finish soft and prone to marking.
Want a Bathroom That Stays Fresh, Not Mouldy?
If your bathroom has a damp problem, flaking paint, or you just want a clean finish done right the first time, Amigos Painters handles the lot. We use the proper moisture resistant paints and sort the mould at the source, not just over the top.
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