The recoat window for Kilz primer varies depending on whether you are using a water-based or oil-based formulation. Water-based options like Kilz 2 can typically be painted over within one hour under normal room temperature and humidity conditions. However, traditional oil-based or shellac-based Kilz primers usually require a longer drying period of two to four hours or even overnight before it is safe to apply your final coats of paint without causing bubbling or lifting.
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