Which Kilz is best for mold?

Which Kilz is best for mold depends on whether you need to kill existing mold or prevent future mold growth, and whether you want a primer or paint. For killing and blocking mold stains, Kilz Original, which is oil-based, is very effective at sealing severe water and mold stains and blocking odors, but it does not contain a mildewcide itself. The best Kilz product specifically for mold is Kilz Mold and Mildew Primer, which is a water-based primer that contains an EPA-registered mildewcide to prevent mold and mildew growth on the primer film, and it is designed for use on areas prone to moisture like bathrooms, basements, laundry rooms, and kitchens. For existing mold, you should first clean and remove mold according to EPA guidelines using bleach solution or mold remover, allow surface to dry completely, then apply Kilz Mold and Mildew Primer, followed by topcoat. Kilz also offers Kilz Mold and Mildew Paint, which combines primer and paint with mildewcide for one-step application. Kilz Restoration, formerly Kilz Max, is also good for heavy stains including mold damage, with low odor. Important note is Kilz does not replace professional mold remediation for large areas over 10 square feet, and you must fix moisture source such as leaking gutters or plumbing that causes mold, otherwise paint will fail. Always wear respirator and gloves when working around mold.