What are the potential problems with Zinsser 123 primer? Potential problems with Zinsser Bulls Eye 1-2-3 primer include limited heavy stain blocking, as it is water-based and may not fully block severe smoke, fire, nicotine, pet urine, or dark tannin bleed in one coat, requiring second coat or stronger primer like B-I-N shellac or Cover Stain oil-based. Some users report it can have poor adhesion on extremely glossy or contaminated surfaces without cleaning, though generally good. It can raise wood grain on bare wood due to water base, requiring light sanding after priming for smooth finish. It may not adhere well to very slick plastics without scuffing. Coverage can be thin on porous surfaces, needing two coats for uniform hide. Some report it can be brittle or peel if applied too thick or in cold humid conditions without proper dry time. It is not ideal for exterior bare wood where oil-based may penetrate better. Also, it is more expensive than budget PVA primers for new drywall where PVA would suffice. Overall, problems are mainly related to expecting heavy-duty stain blocking from all-purpose water-based product, which it is not designed for, so for severe stains it may disappoint.
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