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 4.9 out of 5 by 21.
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
Rated 5 out of 5 by from The coverage was great I bought to seal my basement kitchen 1 year ago and it still looks like I did it a week ago
Date published: 2019-10-24
Rated 5 out of 5 by from Only Brand I use. this is the only brand I use and have been using it for years, It works and I know I can trust it.
Date published: 2019-10-24
Rated 5 out of 5 by from Great coverage! Great coverage to our basement walls! Easy to work with.
Date published: 2019-10-23
Rated 5 out of 5 by from Excellent Sealant on Basement Walls. In a previous house we built, we had slight moisture on our basement walls and used your Kilz product, amazing ! Highly recommend!
Date published: 2019-10-23
Rated 5 out of 5 by from Kilz Basement and Waterproofer I bought this wonderful product because Kilz is a name I trust.We wanted to waterproof our basement and this product worked wonders. It's easy to use looks great and does what it says it does.I would definitely recommend this product.
Date published: 2019-10-23
Rated 4 out of 5 by from Great product! I've used this on my cement wall and am glad i did.
Date published: 2019-07-08
Rated 4 out of 5 by from Quick fix Use this on our basement concrete walls. Our foundation if over 100 years old. It took care of 95% of the water leaks in our basement.
Date published: 2019-06-10
Rated 5 out of 5 by from Covered really good I painted my basement with this product and it worked really good.
Date published: 2019-03-24
Rated 5 out of 5 by from A+ Moisture Blocker We used Kilz Basement Waterproofing for our damp basement walls. We were running a dehumidifier around the clock, prior to painting the entire basement. After we painted, our dehumidifier wasn’t running half as much as it was prior. It definitely worked on our basement with blocking out a lot of moisture. We use the basement for storage and moisture can really ruin things. I’m so glad we made the choice to paint it with Kilz!
Date published: 2019-03-23
Rated 5 out of 5 by from Love This Kilz Waterproofing basement sealer. I highly recommend Kilz over any other brand of basement wall sealer ,waterproofing. We have been dry for 5 yrs. since we last used it. If you need to seal your basement walls, Kilz is the one to use.
Date published: 2017-10-04
Rated 5 out of 5 by from Great Wall Sealer Previous house had basement walls that seeped when the outside ground was damp. A coat of Kilz..and no more seeping.
Date published: 2016-11-21
Rated 5 out of 5 by from East to use, fantastic product. I have used this as an exterior paint for my home's concrete cinder block foundation that was previously painted grey. It is thicker than normal water based paint due to the nature of it's job. I would compare it's consistency to liquid latex or silicone mold casting material. Dries quickly and looks very, very good. I use three coats just because I am over cautious, however I had complete color coverage with two coats. Easy clean up with a light spray of the garden hose if rain kicks dirt onto it from the garden beds. I love this product so much I am going to paint my basement with it.
Date published: 2016-09-06
Rated 5 out of 5 by from Good product! It's thick so hard to apply but understandable! Has worked well!
Date published: 2016-07-19
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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