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What causes wood boards to develop black stains at the nails?

Black causes develop nails stains wood
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What causes wood boards to develop black stains at the nails?

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The stain is caused by natural wood extracts interacting with metal in the fastener. Moist wood increases the likelihood of this interaction. For Cedar, Redwood and Cypress, you should use double-dipped galvanized, stainless steel or aluminum fasteners.

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