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Stains on garrapa

maglio's picture

Can anyone tell me what is causing this stain on a grappa deck and ipe oil applied as per directions

Maglio, How long has the deck (post #182591, reply #1 of 2)

Maglio,
How long has the deck been there?
I see it's a wooded setting, trees over it?
Sunny location, or shaded most of the time?

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Looks like mold. Wood and ipe (post #182591, reply #2 of 2)

Looks like mold. Wood and ipe oil are organic..........food for mold. How has the weather been? Wetter than normal with less than abundant sunshine?

Only other thing I can venture; and I have seen this, is that some one cut some ferrous materials in that area and the filings rusted on the deck surface.

Lottsa folks think I am nuts, but I have used muriatic acid to nutralize stains like that.

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