A sadhu board is one of the few wellness tools you will use barefoot, every day, for years. The wood underfoot is doing real work, and if you ignore it, it will dry, crack along the grain, and start to look tired long before its time. Oiling is the single most important habit you can build around your board. Done right, it takes five minutes a season and adds decades to the wood.
At our workshop in Kostopil, founder Eugene Oliynyk has been standing on the same 20mm board since 2018. He still oils it twice a year. The wood looks better now than the day it was finished. Here is what we have learned about wood oil maintenance from making and using these boards.
Why oil at all
Wood is a living material even after it is cut, planed, and finished. It breathes with the room. In dry winter air it gives up moisture and shrinks. In humid summer it swells. Oil slows this exchange, keeps the surface from going chalky, and stops the fibres around the brass nails from drying out and loosening.
Unoiled boards develop three problems in this order: a dull, grey surface where your feet contact the wood; tiny hairline checks along the grain; and eventually, loose nails as the wood around them shrinks faster than the brass.
Which oils actually work
You want a hardening or semi-hardening oil that penetrates the fibre and cures inside the wood, not a film finish that sits on top. The short list:
- Pure tung oil. Slow to cure but the most durable. Best for boards that get heavy daily use.
- Raw linseed oil. Traditional, cheap, takes weeks to fully cure. Smells honest.
- Boiled linseed oil. Cures in days. Contains driers, so apply in a ventilated room.
- Hardwax oil blends (Osmo, Rubio Monocoat and similar). Easiest for beginners. One coat does the work of three coats of raw oil.
What to avoid: vegetable oils from the kitchen (olive, sunflower, canola). They never cure. They go rancid and leave the board sticky and sour-smelling within a month. Mineral oil is fine for a cutting board but does not protect a piece of wood you stand on barefoot.
How often
For daily practice, oil twice a year. Spring and autumn is the rhythm we recommend, because that is when indoor humidity swings hardest in most climates. For occasional use, once a year is enough.
The board will tell you when it is thirsty. Sprinkle a few drops of water on the surface. If it beads up and sits, the wood is still protected. If it darkens and soaks in within thirty seconds, it is time to oil.
The five-minute application
- Clean the board with a barely-damp cloth. Let it dry completely, at least two hours.
- Pour a teaspoon of oil onto a lint-free rag. Old cotton t-shirt works.
- Rub the oil along the grain in long passes. Cover the whole top, the sides, and the underside.
- Wait fifteen minutes. The wood will drink what it needs.
- Wipe off any oil still glistening on the surface with a dry cloth. This is the step people skip, and it is the difference between a silky finish and a tacky one.
Let the board rest twenty-four hours before standing on it. For tung oil or raw linseed, give it a full week if you can.
The rag warning
Oily rags can spontaneously combust as the oil cures and generates heat. This is not a theoretical risk. Lay the used rag flat outside to dry for a day before binning it, or soak it in water first. Never ball it up and throw it in a closed bin.
The brass nails
Oil will darken the brass slightly. This is fine and matches the patina that develops naturally. If you want bright brass, see our companion guide on polishing brass nails before you oil, not after.
Common mistakes
Too much oil. More is not better. Excess oil sits on the surface, never cures, and stays tacky for weeks.
Oiling damp wood. If the board came in from a humid room or you cleaned it the same morning, the oil will not penetrate. Wait.
Mixing finishes. If your board left our Kostopil workshop with a hardwax oil finish, stay on hardwax. If it was raw oil, stay on raw. Mixing systems can cause the surfaces to repel each other and look blotchy.
Forgetting the underside. The bottom of the board loses moisture too. Oil it whenever you oil the top.
One board, many years
A well-oiled sadhu board outlives most of the furniture in your house. The wood deepens in colour, the brass settles to a warm gold, and the surface develops the soft polish that only feet and time can give it. This is the point. Browse our full range of handcrafted wellness tools if you are starting fresh, but if you already have a board, the best thing you can do this season is oil it.