The waiting period before painting over Zinsser primer depends entirely on the specific product chemistry. Zinsser B-I-N shellac primer dries rapidly and can typically be painted over in just 45 minutes to an hour under normal conditions. Bulls Eye 123 water-based acrylic primer also allows recoating within an hour, whereas oil-based formulas like Cover-Stain generally require a drying window of two to four hours before applying topcoats.
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