Black marks appearing on new deck recently painted with brown oil base stain?

Anonymous asked 4 years ago

New deck installed, painted with brown oil base stain. Now I see black marks appearing. What is this?

1 Answers
Anonymous answered.

If the marks appear near nails or screws then they could be caused by rust or the galvanized coating. If away from metal parts, then it could be tannin bleed or wood sap.

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