How many coats of Zinsser Bulls Eye 1-2-3 are needed?

How many coats of Zinsser Bulls Eye 1-2-3 are needed? For most jobs, one coat of Zinsser Bulls Eye 1-2-3 water-based all-purpose primer is sufficient to provide good adhesion and block light to medium stains. It is designed as high-hiding primer that covers well in one coat over drywall, wood, masonry, metal, and previously painted surfaces. However, two coats may be needed for severe stains like heavy water damage, smoke, nicotine, dark colors, or tannin bleed, where first coat still shows shadow, or for porous surfaces that absorb heavily, or for drastic color change from dark to light. If after first coat stain still bleeds or coverage looks uneven, apply second coat after 1 hour dry time. For new drywall, one coat is usually enough. For glossy surfaces, one coat provides adhesion. So generally one coat for general priming, two coats for tough stains or strong color change. Manufacturer recommends one coat for most applications, with second coat only if needed for complete hide. Avoid excessive thickness, apply even coat, and topcoat after 1 hour.