The duration of Kilz fumes depends heavily on the specific product type and the level of indoor ventilation. Water-based latex primers typically lose their noticeable odor within a few hours to a day as they dry. In contrast, heavy-duty oil-based or shellac-based Kilz formulas release strong chemical odors and VOCs that can linger aggressively for several days or even up to a week unless proper cross-ventilation, fans, and air scrubbers are utilized.
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