Zinsser B-I-N primer is expensive because it is formulated with true natural shellac, a premium, high-performance resin harvested from lac bug secretions. This specialized natural ingredient requires costly denatured alcohol solvents and complex manufacturing processes, but it delivers unmatched stain-blocking, odor-sealing, and drying properties that synthetic water-based or oil-based primers simply cannot replicate on difficult renovation jobs.
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