Painting a bathroom sounds simple until the finish starts blistering six months later. Bathrooms generate more steam and moisture than any other room in the house, and that environment punishes the wrong paint quickly. Apex Painting works on bathroom repaint jobs across Melbourne regularly, and the same mistakes come up time and again: the wrong product, skipped primer, or poor ventilation. This guide covers what actually works.
Why bathrooms are harder to paint than other rooms
Steam from hot showers cycles through the room multiple times a day. That moisture penetrates paint films, softens adhesion and, if there's no ventilation, sits on the surface long enough to encourage mould growth. A standard low-sheen wall paint designed for bedrooms or living areas simply isn't formulated to cope with that cycle of wetting and drying.
The other complication is surface condition. Bathrooms often have existing paint layers that have already started to soften, crack or mould. Painting over those without stripping them back is one of the fastest ways to get a new coat that peels within a year. Preparation matters more here than in almost any other room in the house.
Choosing the right paint for a bathroom
Look for a product specifically labelled for wet areas or bathrooms. These formulations contain mildewcide additives and are engineered to resist moisture penetration. In Australia, Dulux Wash&Wear Bathroom and similar purpose-built products are worth using over a general-purpose interior paint.
Sheen level matters too. A flat or low-sheen finish absorbs moisture rather than repelling it. For bathroom walls, a semi-gloss or satin finish is the practical choice: it wipes clean, resists condensation settling into the film, and holds up to repeated scrubbing. Ceiling paint for bathrooms should be at least low-sheen, not flat, and ideally a moisture-resistant formulation specifically rated for ceilings.
Don't use the same tin you used in the hallway just because there's some left over. It's not worth it.
Surface preparation: the step most people rush
Start by cleaning every surface thoroughly. Bathrooms accumulate soap residue, body oils and mould spores on walls and ceilings even when they look clean. Wash down with sugar soap, rinse well and let the surface dry completely. If there's any visible mould, treat it with a diluted bleach solution (1 part bleach to 4 parts water), leave it for 10 minutes and rinse off. Don't just paint over mould. Paint doesn't kill it and the mould will push through the new coat within weeks.
Check for any flaking or bubbled sections of existing paint. Strip those back to a firm edge with a scraper. Feather the edges with fine sandpaper so you're not painting over a hard lip that will show through the new finish. If there are cracks in the plaster or grout lines, fill them with a flexible acrylic filler, not a rigid compound that'll crack again as the surface expands and contracts.
Prime before you topcoat. A moisture-resistant primer gives the topcoat something to grip properly and adds another layer of protection against moisture ingress. This step is non-negotiable in bathrooms. Skipping primer is the number one reason bathroom paint jobs fail early.
Application technique for a lasting finish
Work in sections and keep a wet edge. Bathroom walls are often tiled partway up, leaving a smaller painted area above the tiles. That sounds easier, but the junction between tile and paint is a common failure point. Use a quality angled brush to cut in along the tile edge cleanly, then roll the remaining wall surface. Press the roller firmly enough to lay the paint without leaving heavy texture.
Two coats is the minimum. Thin single coats over a large area don't build enough film thickness to resist moisture cycling. Apply the first coat, let it dry fully according to the manufacturer's instructions (not just until it feels dry to touch), then apply the second. In cooler Melbourne conditions, full cure can take longer than the tin suggests. Give it at least 48 hours before putting the bathroom back into full use.
Ceilings in bathrooms should be done first, before the walls. Cut in at the cornice, roll the ceiling, let it dry, then work down to the walls. This sequence prevents ceiling drips spoiling a finished wall coat.
Ventilation: during painting and after
Paint in a ventilated space. Open the window, run the exhaust fan, or leave the door open. Solvent and moisture fumes from wet paint need somewhere to go. Good airflow also speeds up drying and reduces the risk of the paint skinning unevenly.
Once the bathroom is back in use, ventilation is the single most important factor in extending the life of your paint job. An exhaust fan running during every shower and for 15 minutes after removes the bulk of steam before it can settle on walls. If the bathroom doesn't have a working exhaust fan, that's worth fixing before repainting. A good paint job in a bathroom with no ventilation won't last, no matter how good the product is. You can read more about this problem in our guide on how to spot paint damage caused by poor ventilation.
When to call a professional painter
Small bathrooms with intact surfaces and a handy owner are genuinely manageable as a DIY job. But if the existing paint has failed across a wide area, if there's significant mould penetration into the plaster, or if the surfaces include complex tiling and joinery that require precise cutting in, a professional will get a cleaner result faster. Apex Painting handles bathroom repaints across Melbourne and can assess surface condition before recommending the right approach.
If you're repainting as part of a broader home refresh before a sale or rental, it's worth thinking about how the bathroom fits into the wider picture. Our guide to choosing the right paint finish for every room covers how to match sheen levels throughout the house so the whole property feels cohesive.
A bathroom repaint done properly holds up for 5 to 7 years with basic maintenance. Done poorly, it can look tired within 12 months. The difference is mostly in the preparation and product choice, not the brushwork.