Sauna wood finishes split into two completely different jobs - interior wood treatment, and exterior wood protection. The interior is the cedar, pine, or fir you sit against; it needs a sauna oil for wood that penetrates, doesn't peel, and is safe at 180°F. The exterior is the outside cladding of an outdoor sauna; it needs a sauna wood sealer that handles UV, weather, and seasonal moisture. Meldos handles the inside, Livos Alis handles the outside, both from Livos in four exterior colors. Ships Canada-wide.
Sauna Wood Finishes
Interior and exterior are two different jobs - pick the right product first.
This is the most important decision on the page, and it's the one most buyers get wrong. The wood inside a sauna and the wood outside a sauna face entirely different conditions, and they need entirely different products.
Inside the sauna, the wood gets to 180°F or higher, cycles through high humidity several times a week, and is in direct skin contact when you sit on the benches. The product on it has to be safe to off-gas - meaning it stays inert at heat and doesn't release fumes you'd breathe in during a session. That rules out almost every common wood finish: stains, varnishes, polyurethanes, and most deck oils release VOCs at sauna temperatures and damage the wood besides. The right interior product is a sauna oil for wood that penetrates into the fiber rather than forming a surface film. The Meldos natural sauna oil is the only interior product on this page - clear, designed for softwoods (cedar, pine, fir), and certified safe to European wood-toy standards (DIN EN 71 Part 3). It's what goes on interior sauna lumber, bench tops, ceiling panels, and the walls of DIY sauna kits when you want the wood preserved without changing its appearance.
Outside the sauna, the conditions invert. The wood is exposed to UV, rain, freeze-thaw cycles, and pests - not heat. The product has to be a proper sauna wood sealer that blocks weather, prevents mold, holds color, and survives years outdoors. The four Livos Alis colors on this page are 3-in-1 exterior products: oil, sealer, and stain in a single can. They don't belong on interior sauna wood - Alis is formulated for the outside.
What's in the cans, and what each color does.
Two product lines, one for each job.
The Meldos natural sauna oil is a 2.5L can of clear impregnation oil. It penetrates deeply into softwood and cures into the fibers rather than sitting on top, which is what makes it survive heat cycling without peeling. The finish is matte, the color shift is minor (the wood looks slightly richer, the way cedar looks when wet), and the oil enhances the natural grain rather than masking it. Application is straightforward: clean and dry wood, brush or roll on, let it absorb, wipe off the excess, dry, and apply a second coat for full saturation. Livos notes it isn't suited for areas with heavy water splashing, cabinet interiors, plywood, or kitchen cabinetry.
The Livos Alis line is the exterior product, in four colors:
- Livos Alis Black - deep dark finish, used on modern dark-clad saunas and on contrast trim
- Livos Alis Light Teak - mid-tone honey wood, the most-bought color for matching standard cedar tones
- Livos Alis Bongossi - dark warm brown, modeled on the ironwood species of the same name
- Livos Alis Sesame - light natural tan, preserves a close-to-natural cedar look while still adding UV protection
All four Alis colors are the same 2.5L can size, same 3-in-1 formula, same application options (roller, brush, or sprayer). The Alis line claims it doesn't peel under normal weathering, which means re-coats happen without sanding the previous coat off. Both Livos products are formulated by Livos out of Germany - a natural-finishes company with a long Canadian operation - and use natural raw ingredients rather than petroleum solvents.
Frequently Asked Questions:
Do I actually need to finish the wood inside my sauna, or can I leave it raw?
Untreated is a legitimate option and a Finnish tradition - many Finnish saunas are left raw and last decades with nothing but a damp cloth wipe-down between sessions. Finishing the interior is for cleanliness, easier maintenance, and color preservation, not structural necessity. If you'd rather skip it, ventilate the sauna well after sessions, wipe benches down, and let the wood develop a natural patina. Cedar, hemlock, and Nordic spruce all do fine untreated.
Can I use regular wood stain, varnish, or deck oil on my sauna?
Never on interior wood. Standard stains, varnishes, polyurethanes, and deck products release VOCs and toxic vapors when heated to sauna temperatures, which you'd be breathing during a session. They also crack and peel under repeated heat cycling because they're formulated for surface-film finishes. For exterior sauna wood, regular deck products can technically work, but a sauna-specific exterior product like Livos Alis is formulated for the heat-and-humidity-and-weather combination an outdoor sauna actually faces.
How often should I re-oil my sauna's interior and exterior?
Interior: once or twice a year for walls and ceilings, more often for the high-contact surfaces like benches and backrests if you use the sauna heavily. Watch for the wood feeling dry or rough, or showing lighter color in spots - those are the signals. Exterior: at least once a year for outdoor saunas, possibly more often if your sauna gets direct sun or a lot of rain exposure. A new outdoor sauna should get its first exterior coat within the first year to lock in the color before weathering starts.
How long does the sauna need to dry before I can use it again after applying oil?
24 to 48 hours of drying time is the standard for both interior and exterior products. After that, heat the sauna empty for 30 to 60 minutes before the first session - this clears any residual odor and finishes the curing process at temperature. Don't rush the drying step; using the sauna before the oil has cured can trap moisture and damage the finish.
Will oiling change the color of my sauna wood?
Clear oils like Meldos darken the wood slightly the way it looks when wet, and enhance the natural grain - subtle, not a color change. Tinted products like the Livos Alis line are designed to change the color, and the four exterior shades (Black, Light Teak, Bongossi, Sesame) give you real range. If you're unsure how a finish will look on your specific wood species, test it on a hidden offcut or an inconspicuous corner first - cedar, pine, and fir all take oil slightly differently.