Yes, you can seal wood naturally by using 100% all-natural Tung oil or 100% all-natural linseed oil. They will take 2-4 days to completely dry and might need multiple applications for protection against moistures.
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Be sure to ventilate the bathroom well with extractor fans or windows. Clean up any spills and wipe down moist surfaces to accelerate drying. Reapply the sealant regularly to maintain the protection...
What precautions should I take when using wood in a bathroom?
Be sure to seal all joints with a bathroom sealant or caulk, and where possible, select wood that is naturally durable, like teak, cedar, or mahogany.