Paint it black

Untreated sauna benches and panel walls can be blackened using the Supi Sauna Wax by Tikkurila. This water-soluble solution with natural wax is colourless but it can be tinted black.

Supi saunavahalla tummennettu, suloinen sauna! Oma koti onnenpesä: Lempeät löylyt - uudistunut sauna

no idea what this says, as I can't read Finnish, but I like the lanterns for light in the sauna.

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