Zinsser Vs Kilz Primers for Mold Removal

You already know that primers are excellent for mold growth removal. But which brand has the best mold-resistant formula for your paint surfaces? For most painters, the decision comes down to Zinsser and Kilz.

Zinsser vs Kilz primer for mold removal

Zinsser and Kilz primers are both suitable for the growth of mold and mildew on most surfaces. Kilz primers are more effective when you scrape off the mold growth before applying the primer, while Zinsser doesn’t require scraping and can prevent future mold issues.

This article will help you further understand these primer brands’ mold-killing ability and give more specific information on certain products. 

Zinsser Vs. Kilz For Mold Removal: Why Do They Work?

Molds are types of fungi that form spores when in contact with moist surfaces. High humidity, leakages, and porous surfaces can enhance this spore formation. 

Zinsser and Kilz Primer can eliminate mold growth because they contain biocides, which kill mold spores. Applying these mold-resistant products to infested areas kills molds and prevents them from returning.

This will help keep your walls, furniture, cabinets, and more clean and safe. While mold growths may not usually be harmful to people, they can induce allergic reactions, worsen asthma, or cause itchy red eyes.

Which Kilz Primer is Best for Mold Removal?

If you’re not a new DIYer, then you’re probably aware of the numerous products under the Kilz brand name. 

However, few of these products are suitable for removing molds. The Kilz Mold and Mildew Interior is one of the best mold-resistant Kilz primers for mold and mildew removal.

Kilz Mold and Mildew Interior/Exterior

Kilz Mold and Mildew Interior/Exterior

The Kilz Mold and Mildew resistant primer is a leading product for mold removal in the Kilz brand. 

This variety blocks not only different types of mold stains but also has high adhesion properties. Furthermore, it contains an EPA-approved active ingredient that provides an extra film on substrates, inhibiting the growth of mold.

This extra paint film is a mildew and mold-resistant film, which is precisely what you need to permanently protect your surface from mold.

Note: Before using this primer, scrape off mold-infested areas, wash thoroughly with vinegar, and leave to dry. You may also sand the affected area before applying the Kilz Mold and Mildew primer and can add a second coat for good measure. 

The product is suitable for interior and exterior surfaces.

Which Zinsser Primer is Best for Mold Removal? 

You want to do this once and for all, so it’s only fair you purchase one of the best brands. Zinsser is a reputable brand with numerous primers designed to handle specific functions. 

The Zinsser Mold Blocking Primer is the most suitable for removing molds and mildews off drywalls, ceilings, and exterior surfaces.

 Zinsser Mold-Blocking Primer

The Zinsser mold blocking primer is the brand’s pride variety on mold blocking and removal. 

The EPA-approved primer is a complete action primer that might just be the solution to your mold problems. Not only does it block already existing mold, but it also has a fungicidal protective coating that blocks fungal organism stains. 

The low-odor, water-based primer also gives an excellent base coat for any topcoat. It has a commendable coverage ability and fast dry time.

Are There Other Options?

What other primer can perform as well as KIlz or Zinsser for mold removal? 

The Best Ultra Exterior Paint is the next-best alternative. It is an all-in-one primer, paint, and restoration formula that covers tough stains, mildew growth, and odors and gives a protective finish against harsh weather conditions. 

The all-purpose paint can be used in low-temperature areas and does the job with fewer coats of paint. It can be used on moisture-prone surfaces and is a good option if you want to try something else.

Practices for Best Mold Removal Results

mold removal practices

Here are some best practices to get superior results from your mold removal primers and paints:

Clean the Area

Scraping off existing mold and washing the area thoroughly will help you achieve the best result. You can clean the surface with vinegar and wipe it off with dry clothing.

Seal Cracks

Molds grow effectively in moist environments, and you can easily prevent this. If you notice any hairline cracks, breaks, or leaks, immediately seal them to avoid future water stains and water damage like mold.

Ventilate the Area

Proper aeration of your house is another way to prevent the growth and spread of molds. The use of dehumidifiers, air conditioning, and fans can maximize mold resistance.


Both Zinsser and Kilz are high-quality primers that you can use to combat mold, though it seems Kilz is more versatile and can be applied to both indoor and outdoor surfaces. Many of these products can also combat household stains and foul odors or unpleasant odors.

No matter which mold-resistant product you choose for the application process, be sure to maximize its efficacy by sealing up any cracks to prevent future water stains, cleaning the area, and ventilating your workspace.