KILZ® Basement & Masonry Waterproofer

KILZ® Basement & Masonry Waterproofer

Where To Buy

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

Please check availability before visiting your local retailer

  • Ratings & Reviews
  • Preparation, Application & Clean-Up
  • Warranty / Warnings
  • Product Specifications
KILZ® Basement & Masonry Waterproofer is rated 4.9 out of 5 by 89.
Rated 5 out of 5 by from Basement Sealed We used Kilz to coat the block work in our basement. Use 3 coated just because and wanted the best seal possible before insulation and sheetrock. This was 4 years ago and to this day have not seen and moisture or mold coming through. Great product!
Date published: 2021-08-27
Rated 5 out of 5 by from My storage space is dry now When I inherited my grandparents’ home, I also inherited a basement that sometimes flooded with water during heavy rainstorms. One corner of the storage room was particularly affected, and I had to throw away several moldy paintings. To make sure I would lose no more of my family treasures, I painted with KILZ, and the results have been amazing. I don’t hesitate to store even my most precious mementos in that room now. Thanks, KILZ!
Date published: 2021-08-24
Rated 5 out of 5 by from Works great Bought this product for my basement and it worked great. Smooth product goes on easily with a roller very easy to use. Dries to a smooth finish. We used it for a basement concrete floor. Clean up with soap and water. I would purchase this again.
Date published: 2021-08-23
Rated 5 out of 5 by from Only 1 coat needed! Painting bricks in basement. Excellent coverage!!!!
Date published: 2021-08-23
Rated 5 out of 5 by from covered first time so happy with it did the job stopped the leakage would buy again
Date published: 2021-04-17
Rated 5 out of 5 by from Worked like a dream! I'm so grateful for this waterproof-er from Kilz! It helped us sell our house by sealing and beautifying an ugly, damp basement. It brightened it up and we were able to seal and protect it while making it a useful space again. I definitely recommend it!
Date published: 2021-04-16
Rated 5 out of 5 by from One coat covered amazingly, no moisture detected I bought the product about 2 months ago out of the cellar was done and it is beautiful it bright one coat covers. I highly recommend this product
Date published: 2021-04-16
Rated 5 out of 5 by from Great product for renewing and moisture reduction I used Kilz to waterproof my basemen walls when I bought my home twenty years ago. It not only renewed the look but strengthened and saved the deteriorating walls. It kept the moisture out. It is now just starting to look like it could be done again. I will be using the Kilz again because I was very satisfied them first time. This time it will be much easier!
Date published: 2021-04-16
Rated 5 out of 5 by from Easy peasy We needed to seal our basement walls before finishing the room. We cut all the edges and corners with a nice 4" brush then rolled it out and it went on quick and easy. Filling little holes in the concrete was a pain but no problems. We put a second coat then top coated with a nice eggshell white.
Date published: 2021-04-15
Rated 5 out of 5 by from Work with the customer for a great job My wife & I painted the cinderblock walls and the concrete floors 2 differant colors of BLUE and love thw look 100%
Date published: 2021-04-14
Rated 5 out of 5 by from KIlz concrete paint Rocks I have used this product for many years. It does a great job covering concrete walls and stays fresh for a long time.
Date published: 2021-02-25
Rated 5 out of 5 by from Great features I needed something to upgrade my basement walls before adding insulation. This was the perfect match.
Date published: 2021-02-24
Rated 5 out of 5 by from One coat coverage I will use more of this product in the years to come.
Date published: 2021-02-21
Rated 5 out of 5 by from From EWW to WOW Out basement walls were 50 shades of orange. We prepped/cleaned them and Kilz basement went on beautifully. I'm not ashamed to go to the basement as anymore!
Date published: 2021-02-20
Rated 5 out of 5 by from Great for basement walls I applied this about 5 years ago. Looks great. Went on well. Make a difference in coolness of the room.
Date published: 2021-02-20
Rated 5 out of 5 by from Thank goodness This was a lifesaver for us. Finally got the basement presentable with no leaks !
Date published: 2021-02-20
Rated 4 out of 5 by from Basement & Masonry Waterproofer Finished raw basement cement walls due to lots of time from self isolation 'cuz of COVID.
Date published: 2021-01-21
Rated 5 out of 5 by from Improved basement dampened quickly! We had an underground wall of the basement seeping dampness along with the nasty smell. After fixing the grading we applied this to the inside of the wall and the smell and dampness have almost disappeared. Even heavy rains don’t penetrate any more. Always used Kilz for painting as a primer on wallboard, now as sealer for concrete.
Date published: 2021-01-20
Rated 5 out of 5 by from High and dry We have always had a wet moldy basement. Last year I had gutters installed and started the long job of sealing and waterproofing the 90 year old walls. I’m so thrilled with how fresh it’s looking and how dry it is.
Date published: 2021-01-20
Rated 5 out of 5 by from Basement & Masonry Waterproofer We have a home built in 1929 and this worked great on the walls. Easy application and worked great.
Date published: 2021-01-20
Rated 3 out of 5 by from Applied to thin? Bought this for basement that had water problems for years. Wanted to seal the concrete block walls. House is about 60 years old but basement is still damp
Date published: 2021-01-20
Rated 5 out of 5 by from GREAT LOOKS Not only does it look great but also it works as it says
Date published: 2021-01-20
Rated 5 out of 5 by from Great for sealing basement I bought this to seal the basement walls before finishing the basement. Easy to apply!
Date published: 2021-01-20
Rated 5 out of 5 by from East to use and the results were great Bought a few years ago, but still looks new! Glad we did it.
Date published: 2021-01-19
Rated 5 out of 5 by from great features product worked to cover what I needed it to and lasts for a long time with what I was using it for my basement walls
Date published: 2021-01-19
Rated 5 out of 5 by from This is great stuff We used this on the wall in the basement of an older home and it sealed and covered the cinderblocks really well. Very easy to put on with very little dripping. Sealed it really well and covered up the stains we no longer have problems on that wall.
Date published: 2020-12-10
Rated 5 out of 5 by from Great product to work with and apply. We sealed the basement walls years ago and still in good condition.
Date published: 2020-12-05
Rated 5 out of 5 by from Fantastic coating We have a 1950's basement a seam line in our basement developed a erosion and hydralic effect inside wall created ingress after craving fatigue , siphoning and backfilling a segment at a time the waterproofed helped in confidence that the work would not need to be repeated after a short span. We wished as a further action we could have injected the coating as a interior coating to further reduce interior erosion.
Date published: 2020-11-21
Rated 4 out of 5 by from Great Really nice to work withlove it can’t go wrong with this project
Date published: 2020-10-18
Rated 5 out of 5 by from all over superb quality and coverage once again always comes through for me amazing quality & product
Date published: 2020-10-18
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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