Yes, a homeowner can absolutely use a paint sprayer on interior walls — and with the right preparation, you can achieve a smooth, professional-looking finish. That said, spraying indoors is more involved than rolling or brushing, and cutting corners on prep or technique can lead to overspray on your furniture, uneven coverage, or wasted paint. Here's what you need to know before you start.
Choosing the Right Sprayer
There are three main types of sprayers suited to interior wall painting:
- HVLP (High Volume Low Pressure): Great for smaller rooms and detail work. Produces less overspray than airless sprayers and is easier to control for beginners.
- Airless sprayer: Faster and better for large open areas. Produces a fine mist that travels further, so masking is critical. Most hire centres stock these.
- Handheld electric sprayers: Compact and affordable, but best suited to smaller jobs or feature walls.
For most DIY interior jobs, an HVLP or a mid-range airless sprayer hired from a local hire centre is a practical choice. Check Bunnings or Mitre 10 for sprayer options to buy, or look for tool hire locally.
Preparation Is Everything
This is where most DIYers underestimate the work involved. Spraying distributes a fine mist of paint across a wide area, so anything you don't want painted will get painted if it's not protected.
Masking and covering
- Remove or cover all furniture — ideally move it out of the room entirely.
- Cover floors completely with canvas drop sheets (plastic sheeting can be slippery and dangerous).
- Mask all skirting boards, window frames, door frames, light switches, and power points with painter's tape and masking paper or plastic sheeting.
- Cover ceiling roses, smoke alarms, and any fixed fittings.
- Seal doorways to other rooms with plastic sheeting to contain overspray.
Surface preparation
- Fill any holes or cracks with a suitable filler and sand smooth once dry.
- Lightly sand glossy surfaces so the paint has something to grip.
- Wipe walls down to remove dust, grease, or grime — a sugar soap solution works well.
- Apply a quality primer if you're painting over bare plasterboard, a dark colour, or a stained surface. GIB has guidance on finishing and priming their plasterboard systems.
Thinning Your Paint
Most interior wall paints need to be thinned slightly for sprayer use, otherwise they'll clog the tip or produce an uneven finish. Check the paint manufacturer's data sheet for thinning ratios — this varies by product and sprayer type. Brands like Resene, Dulux, and Wattyl all publish technical data sheets on their websites. Never guess — over-thinning weakens the paint film.
Spraying Technique
- Test your settings on a piece of cardboard before touching the walls. Adjust pressure and tip size until you get an even, consistent fan pattern.
- Hold the sprayer 300–400 mm from the wall and keep it moving in smooth, overlapping horizontal passes.
- Maintain a consistent distance and speed — slowing down or stopping while spraying causes runs and drips.
- Apply two thin coats rather than one heavy coat, allowing adequate drying time between coats as specified on the paint tin.
- Work from the top of the wall downward.
Ventilation and Safety
This is important. Spraying paint indoors generates fine airborne particles that are harmful to breathe and can be a fire risk with solvent-based products.
- Always wear a properly fitted respirator rated for paint spray — a basic dust mask is not sufficient.
- Wear safety glasses and cover exposed skin.
- Open windows and use fans to ventilate the space, but be aware that airflow can carry overspray further.
- Keep children and pets out of the area during spraying and until the paint has fully dried.
- For solvent-based paints, eliminate all ignition sources. Check WorkSafe NZ for guidance on safe handling of hazardous substances.
Paint Selection
For interior walls, a water-based (acrylic) paint is the easiest and safest option for DIY spraying — lower fumes, easy clean-up, and fast drying. Most leading NZ interior wall paints from Resene, Dulux, and Wattyl are water-based and suitable for sprayer application when thinned correctly.
Cleanup
Clean your sprayer immediately after use — dried paint in the tip and pump is difficult to remove and can ruin the equipment. Flush with the appropriate solvent (water for water-based paints) until it runs clear, following the sprayer manufacturer's instructions.
When to Call a Professional
Painting is not restricted work under NZ law, so there are no licensing requirements — anyone can paint. However, consider hiring a qualified professional painter if:
- You have a large home or complex layout where DIY prep and spraying would take many days.
- You're working with high-end finishes (lacquers, two-pack paints) that require specialist equipment and expertise.
- You're unsure about surface condition, moisture issues, or the right paint system for your situation.
- You want a guaranteed, high-quality result without the risk of overspray damage.
A professional painter will have commercial-grade equipment, years of technique, and the right insurance. You can find qualified local painters on tradedirectory.co.nz.