The best oil for sauna wood is paraffin oil: a clear, odourless, food-grade mineral oil that soaks into the benches and helps them shrug off sweat and water. To apply it, clean and dry the benches, warm the sauna gently, brush on a thin coat, wipe off the excess after 20 to 30 minutes, and let it soak in for a day before you use the sauna. Re-oil once or twice a year.
This guide covers what paraffin oil is, why it suits saunas, how to apply it step by step, how often, and the alternatives such as tung oil and linseed oil.
Key Takeaways:
- What it does: paraffin oil protects bench timber from sweat and moisture, and makes stains easier to wipe off.
- How: clean and dry first, apply a thin coat, wipe off the excess, let it soak in.
- How often: once or twice a year, or more if your sauna gets heavy use.
What is the Best Oil for Sauna Benches?
Paraffin oil is the most common choice for sauna benches. It has no smell, it does not go sticky in the heat, and it does not build a film on the surface, so the benches stay comfortable to sit on. It also leaves the wood looking natural, with only a slight darkening.
What is Sauna Paraffin Oil?
Paraffin oil, also called white oil or liquid paraffin, is a highly refined mineral oil. Food-grade paraffin oil is the same kind of oil used on chopping boards. Sauna paraffin oil is sold in a pure, solvent-free form for timber. It soaks into the wood rather than sitting on top, which is why it suits a hot sauna.
Benefits of Using Paraffin Oil on Sauna Wood
- Protection: it slows sweat and water from soaking into the timber, which helps stop dark stains and grey patches.
- Easier cleaning: oiled benches wipe clean more easily.
- Looks: it brings out the grain, with a slight darkening of the wood.
Before and after a paraffin oil treatment.
Preserving the Wood
Bench timber takes the most sweat and water in a sauna. A regular coat of paraffin oil helps keep moisture out of the grain, so the wood stays in good shape for longer.
Enhancing the Sauna Experience
Oiled benches feel smooth to sit on and look rich and even. A well-kept sauna simply feels better to use.
Sauna Wood Treatment: Necessary Tools and Materials
- Sauna paraffin oil (1 litre of ours does one coat inside a typical 1.8 m barrel sauna)
- A paintbrush or lint-free cloth, and clean rags for wiping off
- Warm water, mild soap and a soft brush for cleaning first, plus gloves
How to Apply Sauna Paraffin Oil
Step 1: Prepare Your Sauna Benches
Clean the benches with warm water and a little mild soap, using a soft brush. Wipe them with a clean, damp cloth, then let them dry completely, which can take several hours. Sand any stubborn stains lightly with fine paper first. See how to clean a sauna.
Step 2: Apply the Paraffin Oil
- Warm the sauna gently, to around 40 to 50°C, then switch it off. Warm wood takes in oil more easily.
- Brush or wipe on a thin, even coat along the grain, including the edges.
- After 20 to 30 minutes, wipe off any oil that has not soaked in. A second thin coat is fine on dry, thirsty wood.
Step 3: Post-Treatment Care
Leave the door open and let the oil soak in for about a day before you use the sauna.
Should You Oil the Wood in a Sauna?
It is optional, but worth it for the benches. Many saunas are left as bare wood and simply cleaned, and that is fine. Oiling the benches makes them easier to keep clean and helps stop dark sweat stains. Walls and ceilings rarely need it. Never use varnish, paint or sealers inside a sauna.
Maintenance Tips for Sauna Benches
When to Reapply Paraffin Oil
Once or twice a year for most home saunas. If you use your sauna daily, or water stops beading on the benches, it is time for another coat.
Common Issues and Solutions
Smoke or smell the first time you heat the sauna after oiling usually means too much oil was left on the surface. Wipe off the excess, let it soak in longer, and use thinner coats next time.
Choosing the Right Paraffin Oil for Your Sauna
Look for pure, solvent-free paraffin oil sold for sauna or food use, with no added scents or driers. It suits all common sauna timbers, including cedar, spruce, aspen, alder and thermowood.
Where to Buy Sauna Paraffin Oil in Australia
Our Paraffin Oil (Interior Care) is Australian made, food-grade, colourless and odourless. The 1 litre bottle costs $33 at the time of writing (October 2026). For the outside of an outdoor sauna, use an exterior oil such as our WeatherProof Oil. See the full sauna care range.
Sauna Paraffin Oil Alternatives
1. Tung Oil
Tung oil is a natural plant oil that soaks in and hardens inside the wood, giving tougher water resistance than paraffin oil. It warms the wood to a honey tone, so it changes the look more. It takes longer to cure, so allow extra time before you use the sauna. Like linseed oil, it is a drying oil: lay used rags flat outside to dry, or soak them in water, because bunched-up rags can heat up and catch fire. Our Tung Oil (Interior Care) is made for interior timber such as sauna benches.
2. Pure Linseed Oil (Cold-Pressed)
Linseed oil lasts longer than paraffin oil, but it can take a week or two to dry, it yellows light woods, and rags soaked in it can catch fire on their own as they dry. Most people find it more trouble than it is worth inside a sauna.
3. Natural Worktop Wax Oil
Hard wax oils give a durable, slightly glossy finish made for kitchen benchtops. In a sauna, a surface finish can feel sticky or hot, so a penetrating oil such as paraffin oil is usually the better choice.
Wrapping Up
A thin coat of paraffin oil once or twice a year keeps sauna benches looking good and makes them easier to clean. Clean first, apply thin, wipe off the excess, and give it a day to soak in.
Frequently Asked Questions
What is the best oil for sauna wood?
Paraffin oil for the benches inside, and an exterior timber oil for the outside of an outdoor sauna.
How do you apply paraffin oil to a sauna?
Clean and dry the benches, warm the sauna gently, brush on a thin coat, wipe off the excess after 20 to 30 minutes, and let it soak in for a day.
Is paraffin oil toxic?
Food-grade paraffin oil is considered safe on skin and is used on chopping boards. Do not drink it, and keep it away from children.
How often should you apply oil to sauna benches?
Once or twice a year, or when water stops beading on the wood.
How do you treat cedar in a sauna?
Inside, cedar needs no treatment, but a thin coat of paraffin oil on the benches makes them easier to keep clean. Outside, protect it with an exterior oil.
Should you oil sauna walls as well as benches?
Benches are the priority, because they touch skin and take the sweat. Walls rarely need it.
Where can you buy sauna paraffin oil in Australia?
We sell Australian-made paraffin oil online, delivered across Australia.
