Both Kilz and Zinsser are industry giants, but professional painters frequently lean toward Zinsser—especially their shellac-based and oil-based lines—for superior stain blocking and odor sealing. Kilz is an exceptional, highly reliable consumer brand that performs wonderfully for standard drywall prep, general home renovations, and routine maintenance, whereas Zinsser's specialized chemical formulations frequently edge it out in heavy-duty commercial and restoration scenarios.
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