After the finish was applied, dark spots appeared
Q: Some friends of ours had their hardwood floors refinished by professionals. The floor looked perfect after sanding, before the finish; but, after the finish was applied, dark pet spots appeared. I am refinishing my floors and I don’t want the same thing to happen. My sanding is complete and floors look good now, but is there the chance that the same will happen? Or was something done incorrectly to cause this to happen to our friends floor?
A: There is no way “pet stains” can be sanded away and disappear, then re-appear. They are either gone or they aren’t. If they aren’t, you will see them on the freshly sanded wood. Perhaps these black marks are the result of “tannin pull”. Occasionally a floor, particularly white oak, can have high levels of tannin which can react with the floor finish and leave black marks. I’ve only seen it a handful of times in 34 years.
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