Is Zinsser 123 a good primer?

Is Zinsser 123 a good primer? Yes, Zinsser Bulls Eye 1-2-3 is considered a good primer and one of most popular all-purpose primers on market. It is water-based, low odor, easy soap and water cleanup, and versatile for interior and exterior use on drywall, wood, masonry, metal, and even glossy surfaces like tile and PVC without extensive sanding, providing strong adhesion. It blocks light to medium stains from water, nicotine, and tannin, and can be topcoated with latex or oil-based paints in 1 hour. It is good for general priming, color changes, and preparing surfaces for paint, offering good hide and sealing porous surfaces. While it may not block severe smoke, fire, or heavy pet odors as effectively as shellac-based B-I-N or oil-based Cover Stain, for most everyday DIY and professional jobs it performs well and saves time. Many professionals keep it as go-to primer for its reliability and ease. So Zinsser 123 is good all-purpose primer for most home projects, especially where adhesion and light stain blocking are needed, though for worst stains shellac-based may be needed.