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I have an outhouse made of 100 year old barn wood, I was told to put boiled linseed oil on it to preserve it and mix with transmission fluid for color. I did the boiled linseed about 3 yrs ago, this year it has turned gradual black from the bottom up, is this a mold? Can I pressure wash it? Thank you

It is mold fed by the linseed oil. Power wash it and apply a good coat of Shell-Guard borate before it dries. The borate will penetrate better in wet wood. Call 800-564-2987 to buy borate.

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