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Defthane to protect black walnut on covered porch?

tds4ou
16 years ago

We just finished putting black walnut on our covered wrap-around porch floor. We double coated the entire board with Defthane's Interior / Exterior Polyurethane before laying it down, and plan on putting another coat after it is all down. Will this protect it? Will we have to apply the polyurethane every year and/or how long will it last?

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