Interior vs exterior paint
How they differ
| Property | Interior paint | Exterior paint |
|---|---|---|
| UV resistance | Low – not needed indoors | High – keeps colour under the sun |
| Flexibility | Firm, smooth film | Flexible – moves with heat and cold |
| Weather & moisture | Not weatherproof | Sheds rain, resists mould and salt |
| Washability | High – scrubbable finishes | Durable but finish-focused less |
| Odour / VOCs | Low-odour options for occupied rooms | Can be higher – made for outdoors |
Can you use one for the other?
Interior paint outside: no. It has none of the UV or weather resistance a Perth exterior needs, so it fades, chalks and peels within a season or two.
Exterior paint inside: not recommended. It can carry higher odour and VOCs and is formulated for durability rather than the smooth, washable finish and low smell you want in a living space. In a pinch on a well-ventilated utility area it will survive, but it is the wrong tool for bedrooms and living rooms.
For the right exterior system in the WA climate, see best paint for the WA sun; for brand ranges, see Dulux vs Taubmans vs Wattyl.
Choosing the finish
Within each type, the sheen matters too. Indoors, low-sheen or matt suits most walls, with washable grades for hallways, kitchens and kids’ rooms, and semi-gloss or gloss for trims and doors. Outdoors, a low-sheen exterior membrane is the workhorse for walls, with gloss enamels for doors and feature joinery. See our interior paint colours and exterior colour schemes guides for colour and finish ideas.
Interior vs exterior paint FAQs
What is the difference between interior and exterior paint?
Exterior paint is built for UV, weather and movement; interior paint is formulated for washability, a smooth finish and low odour indoors.
Can I use exterior paint inside?
It is not recommended. Exterior paints can have higher odour and VOCs and are designed for durability rather than interior finish and air quality.
Can I use interior paint outside?
No. Interior paint lacks the UV and weather resistance to survive outdoors and will fade, chalk and peel quickly.
Is exterior paint more expensive?
Usually yes, because it contains more durable resins and UV-stable additives, but it lasts far longer outdoors.
Using the right paint, inside and out
We specify the correct system for every surface of your home and apply it properly – all in one free, fixed, written quote, usually within 48 hours.
Get a fixed written quote Call 0402 214 353