Zinsser B-I-N is significantly better than Bulls Eye 123 at tackling extreme challenges like heavy fire smoke damage, pet urine odors, severe tannin bleed, and water stains, thanks to its natural shellac base. However, Bulls Eye 123 is better suited for general, everyday interior and exterior drywall priming because it offers lower odor, easier soap-and-water cleanup, and a much more budget-friendly price point for routine projects.
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