The drying time before painting over Zinsser primer varies by the specific formula. Zinsser B-I-N shellac primer dries rapidly and can typically be painted over in just 45 minutes to an hour. Bulls Eye 123 water-based primer also allows recoating within an hour under normal conditions. However, oil-based Cover-Stain formulas generally require two to four hours of drying time to ensure proper curing before applying topcoats.
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