What are VOCs and why do they matter when painting indoors?
Volatile organic compounds, or VOCs, are carbon-based chemicals that evaporate into the air as paint dries. That sharp, solvent-like smell you notice when you open a fresh tin comes from these compounds being released. In a closed room, VOC levels can build up quickly and may cause headaches, dizziness or irritation of the eyes, nose and throat.
Traditional solvent-based paints release high levels of VOCs for hours or even days after application. Water-based acrylic paints, now the standard for interior walls in Australia, contain far fewer VOCs. Many products now carry the Australian Paint Approval Scheme (APAS) mark and are labelled low-VOC or zero-VOC, which means they meet strict limits on emissions and make indoor painting far less hazardous than it was twenty years ago.
Even with a low-VOC paint, some off-gassing still occurs while the film cures. Treat every indoor paint job as a ventilation job first. Opening windows and using a fan to move fresh air through the room will dilute any lingering compounds and protect your lungs while you work.
Which types of paint are safest for indoor use?
Water-based acrylic paints are the most practical low-odour choice for Australian homes. You will find them in every Bunnings or Dulux Trade centre. They use water as the main solvent, so they release far fewer volatile organic compounds than old-style oil-based enamels. A standard acrylic interior wall paint typically sits under 50 grams of VOCs per litre. It is safe to use in living rooms, hallways and bedrooms when you keep a window open.
Low-VOC and zero-VOC labelled paints go a step further. Low-VOC products generally contain less than 16 grams per litre, while zero-VOC paints drop below 5 grams per litre. These are worth the extra cost for a nursery, a child's room or a household with asthma. Natural paints made from plant oils, clay or casein are another option. The range is smaller and you may need to order them from specialist suppliers rather than the big hardware chains.
- Standard acrylic interior paint for walls and ceilings in well-ventilated living areas.
- Low-VOC acrylic for bedrooms and home offices where you spend many hours.
- Zero-VOC acrylic for a nursery, a child’s bedroom or a space used by someone with respiratory sensitivity.
- Natural clay or casein paint for a heritage home with lime plaster that needs to breathe.
- Kitchen and bathroom acrylic with mould inhibitors, choosing a low-VOC version where possible.
- Water-based enamel trim paint for skirting boards and doors, which replaces solvent-based enamels and cuts fumes dramatically.
How should I ventilate a room while painting?
Cross-ventilation clears paint fumes most effectively. Open two windows or a window and a door on opposite sides of the room to create a steady airflow that pulls vapours outside. Place a standard box fan or pedestal fan in one opening, facing outwards. It pushes contaminated air out and draws fresh air through the other opening. Keep interior doors open so fumes do not build up in the hallway or adjoining rooms.
Rooms with only one window need a different approach. Set a fan on the sill blowing outwards, then prop the room door open and open a window in the nearest hallway or adjacent room. This creates a longer air path that still moves fumes away from your work area. A fully internal room with no windows, such as a powder room or walk-in robe, needs two fans. Place one in the doorway blowing fresh air in and a second fan further down the hall directing air toward an open external door or window.
Keep the fans running for the entire painting time and for several hours after you finish the last coat. Do not rely on a ceiling exhaust fan alone, as most household units are not powerful enough to handle solvent vapour. Ceiling fans without an open window simply recirculate the fumes around the room. They do not reduce your exposure.
How long do paint fumes last and when is it safe to sleep in the room?
The strong smell right after painting comes mostly from solvents evaporating as the paint dries. For a water-based acrylic, the surface feels dry to the touch within an hour or two on a typical Sydney or Brisbane day. Most of the odour fades within 24 to 48 hours with good ventilation. Oil-based enamels are a different story. They stay wet longer and can release noticeable fumes for several days as the coating cures.
Drying and curing are not the same thing. A wall that is dry enough for a second coat still releases low levels of VOCs for days or even weeks. Sleep in a freshly painted room only when you can no longer detect the paint smell with the door and windows closed for an hour. For water-based paints that usually means waiting at least one full night with windows open and a fan running before moving back in. With solvent-based products, plan to stay out of the room for a minimum of three to four days, and longer if anyone in the house has asthma or a respiratory sensitivity.
Who should take extra care around fresh paint?
Some people are more sensitive to paint fumes than others, even when using low-VOC products. Pregnant women, babies and young children, older adults, and anyone with asthma or a respiratory condition should limit their exposure. For these groups, the safest approach is to stay out of the house entirely while you paint and for at least 24 hours after you finish.
If leaving the home is not practical, keep the painted room sealed off from the rest of the house with a closed door and a damp towel rolled along the gap at the bottom. Open windows in the rooms where sensitive people are staying, and run a fan to draw fresh air in from outside. Never let a baby or young child sleep in a freshly painted room, even if you cannot smell the paint anymore.
Take these extra precautions:
- Ask your doctor before painting if you are pregnant or have a chronic lung condition.
- Choose a paint labelled low-VOC or zero-VOC and check the tin for the actual VOC content in grams per litre.
- Keep children and pets out of the work area until the paint is fully dry and the room has been aired for at least a full day.
- Wear a respirator mask rated for organic vapours if you have mild asthma and must do the painting yourself.
- Stop work immediately and get fresh air if you feel dizzy, nauseous or develop a headache.
What safety gear do I need for a DIY indoor paint job?
The right protective equipment keeps paint mist, drips and fumes away from your skin and lungs. Even a low-VOC water-based paint can irritate your eyes or airways during a long session, so it pays to suit up before you pop the lid.
For a standard room repaint, gather these basics:
- A half-face respirator with an organic vapour cartridge, rated for paint fumes. A disposable P2 dust mask is not enough when you are cutting in with solvent-based enamel.
- Wrap-around safety glasses to stop splashes and fine mist from reaching your eyes. Regular prescription specs leave the sides exposed.
- Nitrile or neoprene gloves. Latex gloves can break down with some solvents, so check the paint tin for the manufacturer's advice.
- Long sleeves and full-length trousers. Cotton drill workwear is fine; tuck your pants over your boots so drips land on fabric, not your socks.
If you are sanding old paint beforehand, add a P2 disposable mask and a pair of earplugs if the sander runs for more than a few minutes. Wash your hands and face with soap and water when you stop for a break, and change out of your painting clothes before you settle onto the couch.
Frequently asked questions
Can I stay in the house while painting indoors?
Yes, you can stay in other rooms if you close the door to the freshly painted area and ventilate it separately. Avoid sleeping in a room that has been painted that day until the paint is dry to the touch and the solvent smell has faded, which usually takes a few hours for water-based paints.
Are low-VOC paints completely fume-free?
Low-VOC and zero-VOC paints still release a small amount of compounds during drying, so some people may notice a mild odour. They are significantly safer than older solvent-based paints, but you should still ventilate the room until the paint has fully dried.
Does opening a window make the paint dry too fast in hot weather?
In an Australian summer, a breeze can speed up drying and sometimes cause the paint to skin over before it has levelled properly. Keep windows open for airflow but avoid directing a strong fan straight at the wall. Early morning or late afternoon painting helps you avoid the worst heat.
How do I get rid of the paint smell faster?
Place bowls of activated charcoal, bicarb soda or cut onion halves around the room to absorb odours. Run an air purifier with a carbon filter if you have one. The most effective method is still steady cross-ventilation with fresh air moving through the space.
Photo: Ali Mkumbwa, Unsplash (Unsplash License)