The great thing about Western Canadian Red Cedar is that you don’t need to treat it. Left natural, the wood will turn a silver color over time due to the effects of sun and rain with no detrimental effect on the wood itself. If you wish to retain the rich, natural color, you should treat the exterior of the sauna with a UV inhibited stain that will resist the weathering effects of sunlight and rain. Your local paint professional can assist with a suitable product. Note: never treat the interior of the room.