Tongue & Groove Not Waterproof

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Tongue and Groove exterior floor construction is not waterproof, and likely will never be waterproof no matter what primers, paints or sealers you place upon it.

If you were looking to waterproof an area below the porch using tongue & groove you used the wrong material, were mislead or misunderstood the lack of waterproofing ability that tongue and groove wood can provide.