KILZ® Basement & Masonry Waterproofer

KILZ® Basement & Masonry Waterproofing Paint is a premium, interior/exterior waterproofing paint designed for porous concrete and masonry surfaces. This low odor, masonry paint is formulated for waterproofing above and below grade basement walls, masonry walls, retaining walls, cinder and concrete blocks, stucco and brick. It uses nanotechnology to form a barrier to help stop water infiltration. This alkali resistant coating provides a long-lasting, durable and decorative finish. Not for use on floors or on walls with active water leaks.

Available in Gallons

Where To Buy

Please check availability before visiting your local retailer

  • Ratings & Reviews
  • Preparation, Application & Clean-Up
  • Warranty / Warnings
  • Product Specifications
KILZ® Basement & Masonry Waterproofer is rated 4.8 out of 5 by 47.
Rated 4 out of 5 by from protecting crawlspace I used for garage to protect it from flooding & now I need to do the same for my homes' crawlspace
Date published: 2020-07-22
Rated 5 out of 5 by from Easy to use So easy to use on my basement walls and dried extremely fast. No worries now about my walls having mold or mildew forming on them now. Great product
Date published: 2020-07-20
Rated 3 out of 5 by from Great features I bought and liked the product and how it went on the walls.
Date published: 2020-07-20
Rated 5 out of 5 by from Long Lasting Used product on basement walls more than 10 years ago. Getting ready to sell. Thrilled that the basement doesn't even need touch-up.
Date published: 2020-07-19
Rated 5 out of 5 by from Easy to apply, seals great! I put this on a basement wall that had a paint peeling problem. Scraped off the old paint, cleaned the cement then put the Kilz on and have had no problem since.
Date published: 2020-07-19
Rated 5 out of 5 by from Phenomenal Product We used this last year on our concrete block basement when we were selling out house. It did an amazing job, brightened up the basement and sold the house quickly!
Date published: 2020-07-18
Rated 5 out of 5 by from Easy to use - Fantastic product We were very uneasy about using this on our concrete basement. This is the best product !! It was so easy to use and go on the concrete . You didn’t need multiple coats for the basement. We didn’t have any more seeping and you couldn’t tell there was any. This brightened up our basement. We will Be using this again . Plans to use Kilz on our front porch. We are so happy we took the chance and used Kilz. Clean up was a breeze also. Thank you for making a fantastic product. A great value for a quality product.
Date published: 2020-07-18
Rated 5 out of 5 by from It’s an amazing product We use this on our basement walls every few years. We have an older house and the basement holds moisture and we use this!! I will never use anything else!!!!
Date published: 2020-07-17
Rated 5 out of 5 by from great festures ! Used on basement stairs walls really cleaned up the air very pristine.
Date published: 2020-07-17
Rated 5 out of 5 by from Works great Used it on the walls in the basement that gets water and has been holding up great for years no problems.
Date published: 2020-07-17
Rated 5 out of 5 by from It’s easy to use and has kept my basement sealed It’s been on my basement wall and I use the primer as well on my ceilings and wall and it’s the best!
Date published: 2020-04-24
Rated 5 out of 5 by from Life We starred painting our basement years ago then life got in the way so we never finished
Date published: 2020-04-24
Rated 5 out of 5 by from Great coverage Used this in a concrete storage area. Covered really well and refreshed the room for me.
Date published: 2020-04-24
Rated 5 out of 5 by from Best protector ever! I bought this to cover the basement walls in my house 3 years ago! They were a little leaky in areas but this Waterproofed worked awesome and is still going! We were able to paint over it and you’d never know the walls were waterproofed.
Date published: 2020-04-22
Rated 5 out of 5 by from Life saver I bought this awhile back after having some leaking in my basement. Was easy to apply and sure enough no more leaks. Will definitely be buying again.
Date published: 2020-04-21
Rated 5 out of 5 by from Kilz a well known product did not disappoint Bought a lot of kilz products from paint and primer for the bathroom and living areas but also for our basement to water proof it. We had a large crack in the basement so we had to seal to make sure no more water got in and ruined our personal items in our basement. We were worried if it would be hard to diy but with kilz it was not hard at all. It was very self explanatory. Not only did the Kilz work but it kept working the first time we used it was 3 years ago and not one drop of water has gotton though the kilz. The second time we used it was outside recently and again it sealed so perfectly. I love the kilz brand and I will definitely be buying more of this!
Date published: 2020-04-21
Rated 5 out of 5 by from Basement Renewed! My husband used this product to coat our basement walls. It covered well and looked very nice. Refreshed the basement so it was functional. We would definitely use it again!
Date published: 2020-04-19
Rated 5 out of 5 by from Goes on easily. Bought and did wall in basement that was leaking. It wworked!
Date published: 2020-04-19
Rated 4 out of 5 by from Covers Good Good coverage but STRONG SMELL DAYS before we could get the smell out of EVERYTHING!!
Date published: 2020-04-19
Rated 5 out of 5 by from Great product Used this on my home years ago and it's held up great
Date published: 2020-04-18
Rated 5 out of 5 by from Perfect! I couldnt ask for a better waterproofing product. Easy application great results.
Date published: 2020-04-17
Rated 5 out of 5 by from Does an awesome job! I bought this to paint and seal my basement walls. It was easy to use and looks good. No one would ever know that it's paint and a sealer. Worked wonders for me.
Date published: 2020-04-17
Rated 5 out of 5 by from really good product this is unfortunately a very needed product on occasion and it did a excellent job.
Date published: 2020-01-17
Rated 5 out of 5 by from Great waterproofing Bought this for my basement cause of the waterproof benefits and it’s been amazing! Will definitely be using Kiltz for my kitchen and bedroom painting.
Date published: 2019-11-02
Rated 5 out of 5 by from Great barrier for excellent coverage This was great for keeping water out of our basement!!
Date published: 2019-11-01
Rated 4 out of 5 by from great stuff sealed up the block walls in our walk out basement.
Date published: 2019-10-29
Rated 5 out of 5 by from Excellent Kilz. What can i say. Your the best! My ex husband used Kilz on our 1st and 2nd home to seal our basements. That was 30+ years ago. No water has ever came in as of yet! I will always go to Kilz first! Now im on my third home and i would love to use it in my new home!
Date published: 2019-10-29
Rated 5 out of 5 by from Great product I was very happy with the results. Covered nicely . Not bad on smell. Worked great using as a sealer before we laid carpet. Love that it’s waterproof help keeps the mold out
Date published: 2019-10-29
Rated 5 out of 5 by from Awesome product I use this product in my basement, and it worked wonderful! I’m so satisfied with this product!!
Date published: 2019-10-28
Rated 5 out of 5 by from No more leaks Ran out of money few months ago to finish basement walls really fills in the pin holes very nicely i want the walls to look nice because i want to sell in spring 2020
Date published: 2019-10-26
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Proper surface preparation is required.

  • New or Unpainted Surfaces: New concrete must cure for a minimum of 30 days.

  • Test for loose, flaking concrete by pressing a piece of masking or cellophane tape at various places, then pull it off with an abrupt action. If the tape does not pull the concrete from the surface, it can be painted. If the existing concrete is removed, the loose concrete should be removed down to a sound substrate. Prime all uncoated, patched, chalky, and adjacent wood and/or metal surfaces with KILZ Premium Primer.


  • For below grade application: All holes or cracks must be properly patched with a fast-setting hydraulic cement.

  • For above grade application: Remove mildew stains with a mildew stain removing product. All surfaces must be clean and free of dirt, dust, efflorescence and oil. For best results, clean surface with a product such as KILZ Concrete & Masonry Degreaser & Cleaner.


  • DO NOT DILUTE. Stir well before use. Use with adequate ventilation.

  • For best results, apply when air and surface temperatures are between 50-90°F.

  • Apply to dry or slightly damp masonry walls. Wipe off any visible moisture with a dry cloth before painting.

  • Apply using a high quality 1/2"-3/4" nap roller, 4" nylon/polyester brush or an airless sprayer capable of delivering 2200-3200 PSI or greater using a .023"-.025" spray tip.

  • A minimum of two coats are required: First Coat: Using a brush or roller, work the waterproofer onto the surface until any all pores or voids are covered. Second Coat: Using a brush or roller, cover the entire surface. Properly fill any voids left after the first coat. Additional spot application may be needed depending on the porosity of the surface.

  • Important: If leaking is still present after two coats, it indicates that voids or pinholes are still open. Re-apply product to these areas.

  • COVERAGE: Rough surfaces: 75-100 sq. ft; Smooth surface 100-125 sq. ft. Do not apply at a greater spread rate.

Dry Time

  • Wait 1 hour dry to touch; 4 hour recoat. Low temperatures or high humidity conditions will affect drying time. Full cure should be reached in 7-14 days. Fully cured coating can be washed after 7-14 days.

Clean-Up & Disposal

  • Clean equipment and paint spatters with warm, soapy water. If spilled, contain material and remove with an inert absorbent. Dispose of contaminated absorbent, container and unused product in accordance with all current governmental regulations.

  • Do not dispose of this product down a drain. For recycling or disposal information contact your local household refuse collection service.

Cautions / Limitations

  • Do not use on floors.

  • Protect from freezing.

  • For best results, apply at temperatures between 40°F - 90°F. Temperatures above 90°F may affect the application such as drying too fast. Avoid applying in direct sun. NOTE: If the surface is hot to the touch it should be considered too hot to apply this coating.

  • Allow two weeks before washing or cleaning for full cure.

  • Shelf life under normal conditions is two years unopened.

Limited Warranty

Masterchem Industries LLC warrants to the original residential consumer purchaser the performance of this product as described on this label for 10 years on vertical and horizontal surfaces, from the date of purchase, for so long as you reside in your home. THIS WARRANTY IS NOT VALID WHEN THE PRODUCT IS NOT PROPERLY APPLIED TO A PROPERLY PREPARED SURFACE OR CARED FOR IN ACCORDANCE WITH THE LABEL DIRECTIONS. This warranty is not transferable. If this product is found not to perform as specified upon inspection by our representative during the warranty period, 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 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. This warranty gives you specific legal rights and you may also have other rights, which vary from state to state. To make a claim under this Limited Warranty, write to Technical Service, Masterchem Industries LLC, 3135 Old Highway M, Imperial, MO 63052-2834, or email Technical Service at

General Information



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 respir tor to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log on to

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

CAUTION! Sealed surfaces may become slippery when wet. Use caution when walking on surface when moisture is present.

Caution! Irritant!

HARMFUL IF SWALLOWED. CONTAINS: ETHYLENE GLYCOL. MAY CAUSE EYE, NOSE AND THROAT IRRITATION.AVOID CONTACT WITH SKIN AND EYES AND AVOID BREATHING OF VAPORS AND SPRAY MIST. WEAR EYE PROTECTION AND PROTECTIVE CLOTHING. USE ONLY WITH ADEQUATE VENTILATION. To avoid breathing vapors and spray mist, open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headaches or dizziness, increase fresh air and use a properly fitted respirator (NIOSH approved for zorganic vapor with P Series particulate prefilter). Obtain professional advice before using. A dust mask does not provide protection against vapors. Avoid contact with eyes and skin. Wash thoroughly after handling. Close container after each use.

First Aid

  • If you experience difficulty in breathing, leave the area to obtain fresh air.
  • If continued difficulty is experienced, get medical assistance immediately.
  • In case of eye contact, flush immediately with plenty of water for at least 20 minutes and get medical attention; for skin, wash thoroughly with soap and water.
  • If swallowed, get medical attention immediately.


  • Base

    White Base

  • Int/Ext


  • Color


  • Coverage Rate

    75-125 Sq. Ft./Gal. depending on application method and substrate porosity. Does not include the loss of material from spraying.

  • Coverage - Low

    75 sq. ft.

  • Mils Wet


  • Mils Dry


  • Coverage High

    125 sq. ft.

  • Mils Wet


  • Mils Dry


  • VOC

    100 g/L

  • Volume Solids


  • Weight Solids


  • Viscosity

    100-110 KU

  • Flashpoint