KILZ® MOLD & MILDEW<br/> Interior | Exterior Primer

Interior | Exterior Primer







KILZ® MOLD & MILDEW Primer is a water based primer-sealer-stainblocker that is specially designed for residential surfaces in high humidity, moisture and temperature environments such as kitchens, bathrooms, powder rooms and laundry rooms. It offers excellent adhesion to both interior and exterior surfaces and provides a sound anchor for paints. The EPA registered active ingredient creates a mold and mildew-resistant film that protects the primer film from mold and mildew growth.

KILZ MOLD & MILDEW Primer will block most medium to heavy stains including felt marker, grease, ink, pencil, tannin and water stains. It is a fast drying, low odor, very low VOC formula and is easy to clean with soap and water. Not recommended for floors.

Available in Quarts & Gallons

Where To Buy

Please check availability before visiting your local retailer

  • Ratings & Reviews
  • Preparation, Application & Clean-Up
  • Warranty / Warnings
  • Product Specifications
KILZ® MOLD & MILDEW Interior | Exterior Primer is rated 4.9 out of 5 by 183.
Rated 5 out of 5 by from Base on breezeway ceiling I painted my breezeway ceiling drywall some 2000 square feet neglected for 4 years. The paint covered it doing a great job in sealing and protecting. Great stuff
Date published: 2021-06-27
Rated 5 out of 5 by from Great product I bought this for a beach front condo that was having interior ceiling mold so we applied this before finish paint and so far no more mold
Date published: 2021-06-27
Rated 5 out of 5 by from Kilz killed my mold !! Our screened in porch has been experiencing some mold after all the rain that we have had. I bought a can of the Kilz Mold & Mildew exterior primer. After I washed down the ceiling and a part wall I painted the areas and was greatly surprised how it covered in one coat.
Date published: 2021-06-26
Rated 4 out of 5 by from Mold gone kilz I tried it a few weeks ago in an area that started to show mold.. has not returned.
Date published: 2021-06-26
Rated 5 out of 5 by from Great Coverage We used this in our bathroom and shower remodel. Worked great so used in our rental's bathroom & shower/bathtub area. Great coverage and keeps mold away.
Date published: 2021-06-25
Rated 5 out of 5 by from Great product Did an excellent job on my very old plaster kitchen walls
Date published: 2021-06-24
Rated 5 out of 5 by from Toms review Use it all the time redoing painting my houseand shutters
Date published: 2021-06-24
Rated 1 out of 5 by from Go back to metal lids i purchased a gallon of Kilz about a month ago To use on a couple different projects around our new house. The product itself has always been great. The new containers with the plastic lids suck. They do Not seal well. I have always used a hammer to reseal my paint cans show that when I'm ready to use them again I can shake them up with no worries. As I was shaking this can to use it for the 3rd time I did not notice it was leaking until I felt the paint running down my hands. It had leaked all over the carpet and floor of my home. There is no doubt the cause of this was the plastic lids because they will not seal as well as the metal lids. Bear needs to go back to something that works. If it's not broke don't fix it. Now I have to replace carpet not to mention my shoes in my pants.
Date published: 2021-05-15
Rated 5 out of 5 by from kilz mold and mildew interior primer we used it in the bathroom it works amazing. no more washing the ceiling in the hot bathroom after a thousand showers
Date published: 2021-05-08
Rated 5 out of 5 by from Fast and easy Used on interiorwalls for 3 rooms. Had previous mold issues, and some staining. One coat coverage, made all the staining disappear, and made fora nice, even, final coat finish!!
Date published: 2021-05-07
Rated 5 out of 5 by from Consistent Results I have used Kilz products for years and they are always innovating, improving, increasing the quality and raising the bar. I am assured of a clean, good surface for my final product. I have tired others, and even tried the paint that supposedly has the primer already in it, but always wind up disappointed in the result as well as disappointed in how long the fresh finish last compared to using Kilz...I have stopped redoing jobs, wasting paint. I always start with Kilz first. This is a great all purpose product, but there are specialty products for those unique situations With paint as expensive as it has become, you cannot afford to waste is. Use this first for the best and longest lasting result
Date published: 2021-04-16
Rated 5 out of 5 by from Perfect for non-vented bathrooms Used this product in a bathroom with no vent last year. Has held up great. No mold!
Date published: 2021-04-16
Rated 5 out of 5 by from Great for covering dark mold and mildew stains I use this product often and always have great results
Date published: 2021-04-16
Rated 5 out of 5 by from Really Works! Used this to rehab old beach house paneling and walls. Made nice barrier to then apply nice top costs of color.
Date published: 2021-04-16
Rated 5 out of 5 by from bathroom mold used on ceiling in bathroom worked great would use again
Date published: 2021-04-16
Rated 5 out of 5 by from No Better! I’ve used this MULTIPLE times and I am always impressed with the protection and coverage!
Date published: 2021-04-15
Rated 5 out of 5 by from Definitly recomend this primer to anyone I bought and used the primer 8 years ago to prep my bathroom ceiling and walls. It look great and I haven't seen any traces of mold on my shower ceiling. very impressed
Date published: 2021-04-15
Rated 5 out of 5 by from Used on bathroom We bought and used this on the weekend. It worked wonderfully. We had one issue that was user error. Since it was purchased it off the shelf, it was not shaken. That meant I had to find something to mix it with and then mix without spilling. I did notice the second pan I used was thicker than the first which means I did not mix as well as I thought. Next time, we will get it shaken at purchase. It was a learning moment for all.
Date published: 2021-04-15
Rated 5 out of 5 by from Great Way to stop mold in your basement! I used to be a property manager with sub-grade apartments and old houses with basement apartments. I found Kiltz Mold and Mildew Interior to be a FANTASTIC way to stop mold before it ever started in these areas!
Date published: 2021-04-15
Rated 5 out of 5 by from Nice consistency Went on nicely and laid flat . Did not drip and dried fast .
Date published: 2021-04-15
Rated 5 out of 5 by from Home Revitilization Opening a home that has been closed for 5+ years, you never know what you will find. Water damage was certainly expected, and Kilz saved the day... Any project great or small - this is our go to product!
Date published: 2021-04-15
Rated 5 out of 5 by from Awesome coverage 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
Date published: 2021-04-15
Rated 5 out of 5 by from Awesome stuff I bought this product to use on some exterior siding and trim that was replaced due to some water damage. Went on easy, dried quick saved extra coats of paint. After a month, so far so good there's no mold or mildew and paint looks as good as new. Would definitely use again.
Date published: 2021-04-15
Rated 5 out of 5 by from Great Coverate The KILZ Mold and Mildew Primer was excellent in our basement. In addition to providing great coverage we enjoy the added benefit of destroying the mildew problem that was present in our basement.
Date published: 2021-04-15
Rated 4 out of 5 by from Works great!! Or hall coat closet holds a lot of moisture for some reason. We had to remove everything and paint the walls and ceiling with Kilz mold and mildew interior paint. We had planned on using it like a primer and painting over it, but the shade of white was perfect enough for us to leave it. We cleaned all the mold off the walls before we painted a couple coats, and have not seen a single sign of mold in months!! We couldn't be happier with the results and the protection from Kilz. We still have to use the hanging moisture removal bags because the closet still has so much moisture in it for whatever reason. That just proves to me even more that the Kilz is doing exactly what is advertised and supposed to do.
Date published: 2021-04-15
Rated 5 out of 5 by from Toot-A-Loo Mold & Mildew Our beautiful finished basement needed help in the aftermath of water damage from a leaking pipe. We wanted a fresh start and bought this product to prime before painting. We chose correctly. I wanted to feel safe from mold in addition to having it all look good. This product's coverage is superlative and the results were amazing. Whew! A dismal beginning turned into a beautiful ending with Kilz Mold & Mildew!
Date published: 2021-04-14
Rated 5 out of 5 by from GREAT PRIMER We renovated our house 5yrs ago. We used this over new drywall in our bathroom and it coated well. Very thick formula and has upheld better than any other room of the house, and its a humid environment. Now as we are re-doing other areas it is the only primer we use.
Date published: 2021-03-08
Rated 5 out of 5 by from Bye Bye Bathroom Mold Easy to apply and has eradicated the stubborn mold spots that have plagued my bathroom ceiling. 6 months and not a sign of its return.
Date published: 2021-02-23
Rated 5 out of 5 by from Worked perfect and helps protect It worked so well. We’ve had mold issues and took out and repAired areas where molds been and needed extra protection against mold and mildew. We havent had any issues since then.
Date published: 2021-02-22
Rated 5 out of 5 by from Mold and mildew primer I bought this because it’s the only brand I buy. It worked great!
Date published: 2021-02-21
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Surface Preparation

The following steps are recommended for product performance.

  • All surfaces must be clean, dry, free of dust, chalk, oil, grease, wax, polish, loose or peeling paint, rust and all other foreign substances.
  • If washing is necessary, use a non-soapy detergent or a TSP substitute, rinse well and allow to dry.
  • Peeling or Checked Paint: Scrape off loose paint and sand to a smooth surface.
  • Glossy Surfaces: For maximum adhesion, scuff sand the surface thoroughly before priming.*
  • Mold or Mildew Covered Surfaces: This product is designed to prevent mold and/or mildew from forming and contaminating the primer film before topcoat is applied. Although it is designed to be applied directly to mold and mildew prone surfaces, any existing mold and/or mildew on the surface should be removed before priming and painting. This will ensure best results. Wash the area with a mildew remover, rinse with water and allow to dry before priming.
  • Masonry, Brick and Plaster: KILZ MOLD & MILDEW Primer may be used on clean, dry, aged masonry surfaces. New masonry must be allowed to cure (dry) at least 30 days before applying KILZ MOLD & MILDEW Primer.
  • Fire Restoration: Not recommended. Primer Recommendations: KILZ® ORIGINAL, KILZ® ORIGINAL INTERIOR/EXTERIOR and KILZ® RESTORATION.

*WARNING If you scrape, sand, or remove old paint, you may release lead dust. LEAD IS TOXIC. Contact the National Lead Information Center at 1-800-424-LEAD or logon on to



  • Eye protection is recommended. For spray applications, a small amount of water (no more than 1/2 pint per gallon) may be added. Do not thin for stainblocking applications.
  • Only apply if surface, air and product temperatures are between 50°-90°F (10°-32°C). Stir thoroughly before and occasionally during use. Apply using a brush, roller or sprayer.
  • Brush – High quality Nylon/Polyester.
  • Roller – High quality 3/8-1/2" nap on smooth surfaces or 1/2-3/4" nap on semi-rough or porous surfaces.
  • Airless spray – .017-.021" tip / 60 mesh filter.
  • Prime the entire surface to ensure a uniform appearance of the topcoat.
  • Stainblocking: After priming, test for stain bleed-through by applying the topcoat to a small section. If the stain bleeds through the topcoat, apply a second coat of primer and test again before topcoating the entire area. If bleeding continues, a longer dry time is needed before topcoating.
  • Tinting: KILZ MOLD & MILDEW Primer may be tinted with up to 2 ounces of universal colorant per gallon. Tinting to a lighter shade than the topcoat is recommended.
  • Coverage: 300-400 sq. ft. (27.87-37 m2) per gallon depending on application method and surface porosity.

Dry Time @ 77°F (25°C), 50% RH

  • Dries to the touch in 30 minutes at 77°F (25°C) and 50% humidity.

  • Recoat or topcoat after 1 hour.

Clean-Up & Disposal

  • Clean equipment and paint spatters with warm, soapy water.
  • Do not dispose of this product down a drain. Please consider donating any unused product. For recycling or disposal information contact your local household refuse collection service.
  • If spilled, contain material and remove with an inert absorbent. Dispose of contaminated absorbent, container and unused product in accordance with all current federal, state and local regulations. For recycling or disposal information contact your local household refuse collection service.


Masterchem Industries LLC warrants to you, the original residential consumer purchaser, the performance of this product as described on this label for so long as you reside in your home. If this product is found to be defective upon inspection by its representative, Masterchem Industries LLC will, at its option and upon presentation of proof-of purchase (the original receipt), either furnish an equivalent amount of new product or refund the original purchase price of this product to you. This warranty is not transferable. This warranty excludes (1) labor and costs of labor for the application or removal of any product, and (2) any incidental or consequential damages, whether based on breach of express or implied warranty, negligence, strict liability or any other legal theory. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. To the extent permitted by applicable law, any implied warranties including the implied warranties of merchantability and of fitness for a particular purpose, are limited to the duration of this express warranty. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights and you may also have other rights, which vary from state to state. Note to residents of the State of New Jersey: The provisions of this warranty, including its limitations, are intended to apply to the fullest extent permitted by the laws of the State of New Jersey. For warranty service, call: 1-866-774-6371, or email: Masterchem Industries LLC reserves the right to inspect any and all application of the product prior to processing your claim made under this warranty.


This product contains chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.

WARNING! If you scrape, sand, or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, fi out how to protect yourself and your family by contacting the National Lead Information Center at 1-800-424-LEAD or log on to


CAUTION! IRRITANT! HARMFUL OR FATAL IF SWALLOWED. Avoid contact with eyes. May cause eye, nose and throat irritation. Avoid breathing of dust, vapors or spray mist. Open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headache, or dizziness, or if air monitoring demonstrates vapor / mist levels are above applicable limits, wear an appropriate, properly fi respirator (NIOSH / MSHA TC 23C or equivalent) during and after application. Follow respirator manufacturer’s direction for respirator use. Close container after each use. Wash thoroughly after handling and before smoking and eating. WARNING: This product contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm.

First Aid

If swallowed, do not induce vomiting. Get medical attention immediately. If you experience difficulty in breathing, leave the area to obtain fresh air. If continued difficulty is experienced, get medical attention immediately. In case of eye contact, flush eyes immediately with plenty of water for at least 15 minutes and get medical attention.

KEEP FROM FREEZING. If frozen, let thaw at room temperature.


  • Base


  • Int/Ext


  • Color


  • Coverage - Low

    300 sq. ft.

  • Mils Wet


  • Mils Dry


  • Coverage High

    400 sq. ft.

  • Mils Wet


  • Mils Dry


  • Finish @ 85°

    < 10

  • Min Application Temp

    50°F (10°C)

  • Max Application Temp

    90°F (32°C)

  • Viscosity

    95 - 101 KU

  • Dry To Touch

    30 min

  • Dry To Recoat

    1 hour

  • Max Tint

    2 oz

  • VOC

    <5 g/L

  • Brush

    Nylon / Poly

  • Roller - Smooth Surface

    3/8" - 1/2" nap

  • Roller - Porous Surface

    1/2" - 3/4" nap

  • Spray Tip

    .017" - .021"

  • Spray Filter

    60 mesh

  • Spray Pressure

    2,500 - 3,000

  • Volume Solids

    42% (+/-) 2%

  • Weight Solids

    55% (+/-) 2%

  • Flashpoint