Zinsser Mold Killing Primer – Water-Based, EPA-Registered Antimicrobial

Overview

Zinsser Mold Killing Primer is a water-based fungicidal coating designed to protect painted surfaces from mold, mildew, and odor-causing bacteria. It includes an EPA-registered antimicrobial to help inhibit growth on the paint film, delivering manageable protection as part of a wider moisture control plan.

This primer is formulated to work beneath any topcoat, helping to conceal residual fungal stains and provide a stable base for your finish. It can be applied indoors or outdoors on a variety of surfaces, including areas under wall coverings, making it a versatile choice for problem areas and renewal projects.

Key benefits

• Kills existing mold, mildew, and odor-causing bacteria with minimal pre-cleaning
• EPA registered to assure product performance and quality (EPA Reg. No. 87469-1-69587)
• Water-based fungicidal coating that works under any coating and helps cover fungal stains
• Paints directly over existing mold and mildew after addressing moisture issues

Ideal applications

• Residential settings such as bathrooms, basements, and wall cavities
• Commercial and industrial spaces including office buildings and factories
• Indoor and outdoor surfaces where moisture or staining is a concern

Tips for best results

• Pair with compatible topcoats, such as Zinsser Perma-White, to enhance mold resistance in finished walls
• Address moisture sources and ensure surfaces are structurally sound before coating
• Follow the label for remediation guidance if surfaces are structurally unsound

In practice, you may notice the primer forms a uniform, matte finish that accepts subsequent paints evenly. The antimicrobial component targets the paint film itself, offering an extra layer of protection as part of ongoing preventive maintenance. While the product can help manage visible mold and stains on the painted surface, it works best when used in conjunction with proper moisture control and ventilation.