In the article “How to Use Supi Sauna Wax,” I share my personal experiences with using Supi Sauna Wax and how I managed to refresh my Finnish sauna trailer here in the Alps.
If you want to give your own sauna a fresh look or protect its wooden surfaces, you’ll find practical tips and honest insights in this post — from cleaning and waxing to the final results.
How to Use Supi Sauna Wax
In spring 2024, I bought a used sauna trailer that I’ve been renting out to private customers here in southern Germany, in the beautiful Bavarian Alps.
The moment I saw the sauna, I knew the wooden walls needed to be treated with sauna wax. But that first summer, I didn’t manage to get around to it. At first, I didn’t even know where to buy sauna wax.
Being a sauna owner or builder here isn’t as easy as in Finland – you can’t just walk into a local store or hardware shop and find what you need.
During our summer trip to Finland, I thought about buying sauna wax there, but soon realized that bringing it in my luggage might not be the best idea – it takes up space and maybe it’s not even allowed on a plane. I wasn’t sure.
After some searching online, I found one online shop that delivers to Germany. I ordered Supi Sauna Wax – both tinted and clear versions – and also tinted floor oil for the sauna floor.
🪵 Here’s what I used:
- Tinted (233A) Supi Sauna Wax for walls and ceiling
- Clear Supi Sauna Wax for benches
- Tinted (233A) floor oil for the floor
The walls had yellowed quite a bit and there were visible marks from steam and heat. Apparently, the walls and ceiling had never been treated with any sauna protection, which explains the discoloration that had developed in such a short time.
The benches and wall panels are made of spruce.
My original plan was to keep the benches as natural-looking as possible – just protected with clear wax. However, I ran out of wax and only managed to finish the upper benches.
The front parts I ended up treating with regular oil, as I had done before. Next time, I’ll definitely order a bit more of the clear wax!
🧽 Step 1: Wash the Sauna
Always start by washing your sauna surfaces thoroughly.
If the wood looks uneven in color or glossy in some spots, sand it lightly and wipe off the dust with a slightly damp cloth.
Read more: How to clean the sauna
🪶 Step 2: Applying Supi Sauna Wax
Here’s how to use Supi Sauna Wax correctly:
- Stir well before and during use. The pigments tend to sink to the bottom.
- Pour some wax into a separate container – especially if you’re using a small roller.
- Apply with a foam or synthetic brush in a thin, even layer.
- Work on one or two panels at a time.
- Wipe off the excess immediately with a lint-free cloth.
(If you skip this, the surface can become slippery!) - Let it dry for 24 hours before heating the sauna.
- Preheat and ventilate well before your first sauna session.
💡 A Few Lessons Learned
I’m really happy I finally managed to wax my sauna trailer – but there were a few surprises along the way.
Even though I stirred the tinted wax carefully (and often!), I later noticed that some of the darker pigment had settled at the bottom of the can. That, of course, affected the color consistency a bit on the walls.
Also, the instruction on wiping off the excess wax with a lint-free cloth was missing from some of the guides I found online – and even from the product label! Luckily, I had read a Finnish source before starting, so I knew to do that, and it made a huge difference in the final result.
Applying wax inside a barrel-shaped sauna wasn’t the easiest either. The curved walls and loose panels meant I had to be extra careful to get into every little corner.
Still, I absolutely recommend waxing your sauna if you want to refresh its look and protect the wood. It took me about two days in total – including cleaning and preparation – maybe around 10 hours altogether.
🌿 Is Supi Sauna Wax Safe?
Yes – Supi Sauna Wax is designed especially for sauna interiors.
It’s water-based, low-odor, and safe once dried. The wax contains natural wax and resin that protect the wood from moisture and dirt without sealing it completely, allowing the surface to breathe.
This makes it a great and eco-friendly choice for sauna walls, ceilings, and benches.
I hope this article helped you understand how to use Supi Sauna Wax and what to expect from the process.
Warm greetings from the Alps –
Kati, a happy owner of a freshly renewed sauna trailer 🪵✨
