What is the best odor killing primer? The best odor killing primer is generally considered to be shellac-based primer, specifically Zinsser B-I-N Shellac-Base Primer, which is widely rated top for sealing odors from smoke, fire damage, pet urine, cooking, and musty smells, because shellac encapsulates odor molecules completely and dries quickly, blocking them from bleeding through topcoat. Among Kilz line, Kilz Original oil-based primer is very effective for odors, and Kilz Restoration Maximum Stain and Odor Blocking is best water-based low-odor option that approaches shellac performance. Oil-based primers block odors better than standard water-based. For best results, first remove source, clean surface, fix moisture, then apply primer. For severe odors like heavy nicotine or fire, shellac-based Zinsser B-I-N is usually recommended as best, though more expensive and has strong alcohol smell during application that dissipates quickly. For moderate odors, Kilz Original oil-based or Kilz Restoration water-based are excellent and more readily available. So best overall is shellac-based, with oil-based Kilz Original as strong runner-up for heavy odors.
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