How long a house smells after refinishing hardwood floors depends heavily on the type of finish used, ventilation, and humidity. For traditional oil-based polyurethane, which is the strongest smelling, the intense odor typically lasts 3 to 5 days, with a noticeable smell lingering for up to 2 weeks, and a faint odor detectable for up to 30 days as it fully cures. The fumes contain volatile organic compounds that are strong, so professionals recommend staying out for at least 2 to 3 days and ventilating heavily with open windows and fans. Water-based polyurethane is much less smelly, with strong odor for only 1 to 2 days and minimal smell after 3 to 5 days, and it cures fully in about 7 days. Natural penetrating oils like tung oil or hardwax oils have a mild earthy smell for 2 to 3 days. Factors that extend smell include high humidity, low ventilation, thick coats, and lack of air circulation. To reduce odor faster, keep windows open, run box fans blowing out, use air purifiers, keep temperature around 70 to 75 degrees, and avoid covering floors with rugs until fully cured. Most families can return comfortably after 3 days for water-based and 5 to 7 days for oil-based.
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