Re-dampening urine stains

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Q: I have old urine stains on my hardwood floors. There is no odour or buckling, just dark marks. When the moisture is high these areas become damp. How do I stop this?

A: If I understand you, during high humidity these old pet stains become damp? I don’t have any clue why that would be. If you want to apply something over these spots to stop odour, I would suggest the Universal Sealer, which is shellac based and made by Zinsser.

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