Hi, here's an odd one, I fitted new live edge kiln dried oak worktops 3 days ago, they had 2 coats of oil on them, I have them a third, then cut the holes out and gave the cut outs 3 coats allowing drying time inbetween , then before the appliances went in, a final all over coat, we put a composite overlay sink in, the plumber fitted it 3 nights ago, and today we noticed black marks which look like water marksing the back edge of the sink, any ideas??,
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