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Mold and Mildew 1 qt. White Water Based Interior and Exterior Primer, Sealer and Stain-Blocker

  • Mold & mildew resistant primer film for moisture-prone spaces
  • EPA-registered ingredient prevents mold/mildew on primed surface
  • High-hiding stain blocker blocks medium to heavy stains
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Product Overview

KILZ primers help to seal surfaces, enhance adhesion, stain and odor block, hide marks and colors and more

A little primer investment goes a long way

Priming helps ensure a better quality finish that will last by addressing surface problems prior to painting


KILZ is a trusted brand by pros and DIY’ers for over 45 years

KILZ has water-based and oil-based primers to help in different ways

KILZ Interior, Interior/Exterior, and Low Odor Primer cans on dropcloth

KILZ primers can handle your projects

From KILZ 2 ALL-PURPOSE to legacy oil-based KILZ ORIGINAL primers to our specialty products, there is a Kilz primer for you.

Apply KILZ Primer on exterior wall with sprayer

Seals porous surfaces

Sealing the surface helps achieve a uniform professional quality finish using less coats of paint

Lifestyle bedroom with wall paint in black and white paint

Hides scuffs, stains and previous colors

Our high hiding primers hide previous colors well; making them ideal for color change projects

KILZ Primer being applied covering stains on wall

Powerful stain blocking

Our stain blocking primers are proven performers when it comes to blocking stains to prevent leaching through the topcoat

Lifestyle kitchen using KILZ Primer and painted with blue cabinets

Excellent adhesion

Excellent adhesion to the surface and also to the topcoat paint helps ensure a longer lasting quality finish

Seal unprimed drywall for best results


Most pros apply primer to drywall to seal the surface and ensure a uniform finish

New cabinet with KILZ Primer being brushed on


Primer fills the grain in the wood helping to smooth out the finish

Unpainted brick wall with KILZ Primer being rolled on


Painting over brick is a popular alternative to replacing it. Priming first before painting helps make it look its best

Applying KILZ Primer with roller to unpainted masonry wall


Priming with alkali-resistant primer helps solve adhesion problems caused by high pH levels in some masonry

Applying Kilz Primer with roller to plaster wall


Lime from plaster can cause stains to bleed through the topcoat. Stucco may absorb moisture from the topcoat discoloring it.

Applying Kilz Primer with brush to door

Other Surfaces

KILZ has multi-use, multi-surface primers and specialty primers that solve specific problems including hard to paint surfaces

Specially formulated to prevent mildew (and potentially mold) from growing on the primed surface before paint is applied, KILZ Mold and Mildew Primer contains active ingredients that are registered with the Environmental Protection Agency. This mold and mildew resistant film protects the primer film, sanitizes the surface it is applied to against fungi organisms and helps ensure a fungi-free primed surface for painting. KILZ Mold and Mildew Primer blocks stains such as markers, lipstick, food stains, smoke, nicotine, grease and more. This primer has a thicker consistency compared to most non high build primers which helps achieve a more uniform finish. The primer also helps paint bond to multiple surfaces and ensure years of topcoat integrity. Use over and under alkyd, oil and water based paints, this primer dries quickly, has a low odor and is environmentally conscious with little to no volatile organic compounds.
  • Contains EPA-registered mildewcide
  • Medium to heavy stain blocker
  • Excellent adhesion
  • Seals porous surfaces
  • Apply topcoat after using KILZ Primers
  • Very low VOC formula
  • Fast dry - paint in 1 hour or less
  • Easy soap and water clean-up
  • Click here to shop drywall sheets to complete your project
  • Online Price includes a Paint Care fee in the following states: CA, CO, CT, DC, ME, MN, OR, RI, VT, WA
  • California residents

Info & Guides

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Paint/Stain/Waterproofer Product TypePrimerSealerPrimerPrimer
Primer PurposeColor Changing,Mold, Mildew & Water Damage,Odor Blocking,Sealant,Stain BlockingSealantColor Changing,Low Odor,Sealant,Stain Blocking,UniversalColor Changing,Low Odor,Sealant,Stain Blocking,Universal
Container Size1 Quart1 Gallon1 Gallon1 Gallon
Surface Material UseBrick,Drywall,Masonry,Metal,Plaster,Stucco,WoodDrywallBrick,Concrete,Drywall,Masonry,Metal,Plaster,Plastic,Stone,Stucco,WoodBrick,Concrete,Drywall,Fiberglass,Metal,Plaster,Plastic,Stucco,Vinyl,Wood
Paint/Stain FeaturesFast Drying,Low Odor,Mildew Resistant,Mold Resistant,Stain ResistantFast Drying,Low Odor,Sealer,Tintable,Top Coat RequiredFast Drying,Low Odor,Mildew Resistant,Sealer,Tintable,Top Coat RequiredFast Drying,Low Odor,Mildew Resistant,Sealer,Tintable,Top Coat Required
Application MethodBrush,Paint Sprayer,RollerBrush,Paint Sprayer,RollerBrush,Paint Sprayer,RollerBrush,Paint Sprayer,Roller
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Container Size
1 Quart


Application Method
Brush,Paint Sprayer,Roller
Base Material
Water Based
Coating Product Category
Color Family
Color Family
Dry to touch (min.)
30 min
Number of coats recommended
Number per Package
Paint/Stain Clean Up
Soap & Water
Paint/Stain Features
Fast Drying,Low Odor,Mildew Resistant,Mold Resistant,Stain Resistant
Paint/Stain/Waterproofer Product Type
Primer Purpose
Color Changing,Mold, Mildew & Water Damage,Odor Blocking,Sealant,Stain Blocking
Surface Material Use

Warranty / Certifications

Manufacturer Warranty
Limited Lifetime

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.8
    out of 482 reviews
  • 97% recommend this product
Filter by:
Showing 1-10 of 482 reviews
Kill Mold and Mildew interior/exterior primer work
[This review was collected as part of a promotion.] I have used this product on mold in our basement wall and also on sub-flooring in several spots inside our renovation project. It covers great, dries quickly, and there is little odor.
    • Recommended
    Great Results in Our AC Closets
    [This review was collected as part of a promotion.] I have a client with over 300 units in South Florida, with all the humidity and rain mold can build up quickly. We started implementing as part of our schedule maintenance to paint all AC closets with Kilz Mold & Mildew Primer and the results have been great!
      • Recommended
      Did not like this
      With this many positive reviews it seemed great before I started to paint. Its not sticky at all over joint compound. I cleaned the walls very thoroughly before. See picture. The coverage is ok but It’s the worst primer I’ve painted with.
      Response from KILZProblemSolverAug 19, 2021
      Hi Andre - Thank you for your review. I'm sorry to hear that this primer isn't sticking to the joint compound on your walls. Based on your picture, it looks like the primer may be pulling off the surface in these areas. To fix the finish, I recommend adding up to 4 oz. of water per gallon to your primer, mixing it in thoroughly, then re-priming. For further assistance with your project, please feel free to reach out to us directly. We'd be happy to help. - Sara Kilz
        Awesome coverage
        [This review was collected as part of a promotion.] I just used this on the out side of my home its a great product my home is 130 years old and I'm repainting it and killz is the only primers I trust i know I will not have to repaint for years to come
          • Recommended
          Difficult to apply
          I bought this product to repaint our bathrooms. From starters, the product was too dense. Since there were no instructions about adding water to thin it, I used a standard paint roller. The results were horrible, as the primer would no adhere well to the paint or cover pores on the surface. Moreover, it would not spread uniformly and require extreme pressure on the roller. With sore arms, I added some water to the primer in the pan, which thinned the primer a bit but did not improve coverage. See the photos below. I want to know how I fix this mess, as I am not going to paint on the primer until I get it right.
            The label on the can..easy to read and pick the co
            [This review was collected as part of a promotion.] Bought this product for an area behind the refrigerator. Wall looks so much better
              • Recommended
              Great barrier for van reno!
              [This review was collected as part of a promotion.] We applied 2 coats of kilz to our base floor in our van renovation prior to laying linoleum. I feel confident that kilz has created a safe barrier for the floor!
                • Recommended
                Awesome results
                [This review was collected as part of a promotion.] We have purchased Kilz for years it is the best on the market that’s a fact!
                  • Recommended
                  [This review was collected as part of a promotion.] I had a mild issue in my bathroom and I decided to try KILZ and it was the best thing I could have ever done. I cleaned and scraped the area: The mold dissapeared and was never to be seen again. It was amazing and I'm glad I went with my gut feeling to use this product because it was worth it.
                    Best ever
                    [This review was collected as part of a promotion.] I'm working on the second oldest church in Davenport, being condemned over 40 it's need of heavy restoration. I had to stop because I ran out of funds.
                      • Recommended
                      Showing 1-10 of 482 reviews