The best product for mold is KILZ Mold & Mildew Primer. It is a powerful water-based primer formulated with an EPA-registered mildewcide designed specifically for high-humidity areas like bathrooms and kitchens.
Contrary to its name, Kilz does not kill existing mold. Instead, Kilz primers are designed to prevent future mold and mildew growth on the dried paint film and to seal in tough stains.
Kilz 2 and Kilz 3 are both water-based, multi-surface primers, but they differ in formula density and stain-blocking power. Kilz 2 is an everyday, budget-friendly option for minor color changes, while Kilz 3 is a thicker, premium-grade product offering superior hiding power, adhesion, and stain-blocking.
The undisputed industry standard for mold-killing primers is Zinsser Mold Killing Primer. It is an EPA-registered, water-based fungicidal coating that actively kills existing mold, mildew, and odor-causing bacteria while preventing future growth on the paint film.
Zinsser Mold Killing Primer is used to paint over and kill all existing mold, mildew, moss, fungi, odor causing bacteria and any other fungal organisms, it does not prevent mold from growing on the top coat. As a primer, Mold Killing Primer must be top coated.
Mold is generally at its worst from early spring through early fall (specifically July through October), peaking during the warmest and most humid months. Mold thrives in warm temperatures (60∘F to 80∘F) combined with relative humidity levels above 60%.
The best product for mold is KILZ Mold & Mildew Primer. It is a powerful water-based primer formulated with an EPA-registered mildewcide designed specifically for high-humidity areas like bathrooms and kitchens.
To kill mold permanently, you must combine targeted remediation with moisture control. No product works permanently if the source of moisture remains. The most effective approach includes using specific biocides, removing infested porous materials, and managing your home's humidity.
Black mould can be painted over, but it's important to cure the afflicted surface first and deal with the underlying problem. Directly painting over untreated mould will only momentarily conceal the issue because the mould can still grow and spread underneath the paint.
KILZ 3™ Premium is one of our more heavy-duty and high hiding formulas, making it ideally suited for blocking old dark colors or covering substantial stains.
KILZ 3® PREMIUM primer is a superior quality, fast drying, low odor, very low VOC, water-based primer-sealer-stainblocker. It has excellent adhesion and provides a mildew resistant coating making it ideal for use in moisture-prone areas.
Kilz and Zinsser are the two heavyweight titans of the primer world, but they excel in slightly different applications.
Hydrogen peroxide (3%) or distilled white vinegar are the fastest, safest, and most effective ways to kill black mold instantly on contact. Bleach is generally ineffective as it only bleaches the color while leaving the roots alive.
Mold toxicity (mycotoxin illness) happens when prolonged exposure to mold spores triggers chronic inflammation and immune system activation. Symptoms are often subtle and mimic other illnesses, but common red flags include persistent allergy-like reactions, chronic fatigue, unexplained brain fog, recurring headaches, and respiratory or digestive distress.
Prior to applying the primer, remove any mold or mildew with a proper remover or have it removed by a professional. In severe cases, the moldy substrates may need to be replaced. Once the surface is mold and mildew free, ensure it is clean and dry before applying primer.
Never mix chlorine bleach solution with other cleaning solutions or detergents that contain ammonia because toxic fumes could be produced. Please note: Dead mold may still cause allergic reactions in some people, so it is not enough to simply kill the mold, it must also be removed.
For the strongest, professional-grade mold stain removal, contractor-strength formulas using sodium hypochlorite (bleach) are generally the most effective. For total root destruction on porous materials without bleach, specialized biocides and botanical solutions offer long-term remediation.
Yes, mold can absolutely come back after using vinegar. Vinegar kills about 82% of mold species, but it does not destroy all of them, and it is largely ineffective at preventing mold from returning if the underlying moisture problem remains.
No, you should never paint over mold without properly cleaning it first.
Choose the Right KILZ® Primer
Both KILZ 2® All Purpose and KILZ 3® Premium are perfect for interior and exterior priming on multiple surfaces. KILZ 3® Premium is the right primer for heavy duty sealing and blocking out stains or dark colors.
Professionals eliminate mold by addressing the source of moisture and following strict containment protocols. They typically follow a five-step process:
Mold exposure primarily causes allergy-like symptoms such as sneezing, runny or stuffy nose, coughing, itchy or watery eyes, and skin rashes. In sensitive individuals or those with asthma, it can trigger wheezing, chest tightness, and shortness of breath.
The ideal temperature is between 77 and 86 degrees Fahrenheit. During the summer months, temperatures are often higher than normal inside the home. Make an effort to keep temperatures inside the home lower during the summer months. Setting the thermostat to the low 70s makes it more difficult for mold to grow.
In A Nutshell: Misconceptions About Mold
Your home can be 100% mold-free: No, there are always mold spores in the air. Anyone can effectively remove mold: No, you need professional services for that.