KILZ® Concrete & Masonry Protector & Waterproofer

KILZ® Concrete & Masonry Protector & Waterproofer utilizes the latest water-based, silicone technology providing an interior/exterior waterproofing formula designed to penetrate up to 1/2" into the surface. This waterproofer creates a barrier keeping water out, but allowing trapped water vapours to escape resulting in reduced corrosion, spalling, efflorescence and freeze-thaw damage. The protection is not worn away with normal use creating lasting durability for the surface. Ideal for horizontal and vertical uncoated concrete and masonry surfaces such as: Concrete Blocks, Pavers, Stucco, Brick, Unglazed Tiles, Exposed Aggregate Concrete, Sandstone and Slate. Not recommended for use on areas subject to hydrostatic pressure such as basement walls or floors. For residential applications only. Apply in sections so wet material does not have to be walked on during application.

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® Concrete & Masonry Protector & Waterproofer is rated 4.9 out of 5 by 45.
Rated 5 out of 5 by from Saved my carpet installation! My house has a concrete slab in New England, crazy I know! However when I went to have new carpet installed, it was evident that my floor needed to be sealed ASAP. I went out and got the concrete sealer was able to get it all done and my carpets were installed. What an amazing difference in the field under my feet especially in humid weather. Has totally sealed the floor and I never get that damp icky feeling on my feet anymore
Date published: 2020-07-19
Rated 4 out of 5 by from Protects It is expensive and I need more the $250 gift card will help me alot to finish waterproofing going restifmy basement. Thank you
Date published: 2020-07-18
Rated 5 out of 5 by from Looks and works well! we repainted our basement with this and it looks incredible! Even with the wet spring no issues at all with moisture.
Date published: 2020-04-24
Rated 5 out of 5 by from Concrete sealer/waterproofing I power washed our driveway clean then after it dried completely I applied the concrete with Kilz to the surface. That was two years ago and it still looks great and very easy to clean. I love the product and recommend it to everyone!!
Date published: 2020-04-24
Rated 5 out of 5 by from Wet basement cinderblocks Before we moved we purchased 5 gallons of this and painted all the basement walls because they always looked wet. This stuff is a miracle worker. No more wet walls and basement stopped smelling damp
Date published: 2020-04-23
Rated 5 out of 5 by from Lasts and lasts I used this in my basement about five years ago. The coverage is great.
Date published: 2020-04-23
Rated 5 out of 5 by from Kept out water in my basement My basement always floods they the walls and floor. I put the sealer on every five years and it stays dry!
Date published: 2020-04-22
Rated 5 out of 5 by from Great product! I bought this product last week best product ever.
Date published: 2020-04-21
Rated 5 out of 5 by from Protects beautifully! I have used this on several projects for relatives and in my own home. Preparing to seal newly applied stucco on my home and this product is what I will be using.
Date published: 2020-04-20
Rated 4 out of 5 by from Redoing Basement floors We got this in hopes/planning to redo our basement do to some issues the prior year. This proved to be a wonderful experience and has held up amazingly so far.
Date published: 2020-04-20
Rated 5 out of 5 by from Covers Dog Smell Worked perfectly on our slab floor and haven’t had any smell or issue once we installed carpet.
Date published: 2020-04-19
Rated 5 out of 5 by from Great Waterproofing Used it to paint and prime my basement shower walls. Looked and worked great.
Date published: 2020-04-19
Rated 5 out of 5 by from Works great! I've been doing projects at home and I'm using quite a bit of this! I Love this product!
Date published: 2020-04-19
Rated 5 out of 5 by from I happy it stop the rain coming in Happy it work I like the product I would buy again if not so stop rain coming I. I like basement area
Date published: 2020-04-19
Rated 5 out of 5 by from Great features Great stuff! Easy to apply! Looks great when it is done.
Date published: 2020-04-19
Rated 5 out of 5 by from Best product! This product was used in my basement. Walls painted. No water stain. No seeping! It totally does what is says! Great stuff!!!!!
Date published: 2020-04-19
Rated 5 out of 5 by from Amazing product! Before refinishing our basement. We had a mold issue where the concrete would sweat in the summer. We cleaned it real good and applied this product. We have not seen mold since. It is awesome.
Date published: 2020-04-19
Rated 5 out of 5 by from Great stuff love how it keeps the basement dry and water this stuff!
Date published: 2020-04-19
Rated 5 out of 5 by from I like this product.. Because we had a leaky basement wall and after my son applied it, we don't have issues. And that's not all! I'm an artist and I use it on canvas, too!
Date published: 2020-04-18
Rated 5 out of 5 by from Easy to work with Great for New Orleans humidity , choice of colors great, very easy to apply
Date published: 2020-04-17
Rated 5 out of 5 by from Complete coverage top to bottom Had a dry basement with one crack we had professionally repaired. We were going to insulate & cover about half of the walls as we were making a family room in the basement but want it all to look good & be protected. We decided to use Kilz Concrete & Masonry Protector & Waterproofer to not only take care of any small cracks in the concrete but seal all of it. In the areas not being covered over it lent to a continuous color & even look to the walls in the maintenance & storage area making it more appealing. Being on the thicker side it also evened out the walls giving it a smoother look. We were advised by the company that repaired the small crack that this would not only take care of any hairline cracks but also make the walls look better and they were right. GREAT PRODUCT
Date published: 2019-11-02
Rated 5 out of 5 by from Far better results than I could have imagined! With a historically wet basement, we bought this product as our last-ditch effort to help dry things out... and what a job it did! Not only did it help patch the leak, but it plugged the gap and prevented further water from entering the basement! Awesome product!
Date published: 2019-11-01
Rated 4 out of 5 by from Worked Great ! I was doing a craft project out of concrete pavers.I was sealing the pavers and then painting them green ,white and yellow.It sealed the pavers really good and many years later they are still holding the paint and look great.
Date published: 2019-11-01
Rated 5 out of 5 by from I've used it 2 different times and never a hint of I've had success with it and so why would I not trust it in the future.
Date published: 2019-11-01
Rated 5 out of 5 by from Kilz and us. I bought this product a year ago and have used and will use more Kilz products because they actually work. Their prices are affordable and it's easy to use.
Date published: 2019-10-31
Rated 5 out of 5 by from Looks great, low odor. We purchased this product a few months ago after we started getting some water in our basement. Glad to say that there has not been any more water issues and it was easy to apply.
Date published: 2019-10-29
Rated 5 out of 5 by from Great waterproofer Bought this week ago so we can waterproof footing we poured for garage. Went on smoothly and covered well. Thanks
Date published: 2019-10-28
Rated 5 out of 5 by from It works! I used this in my basement to paint after I cleaned the walls near the floor.I was pleased with the results.
Date published: 2019-10-27
Rated 5 out of 5 by from works great I applied about a month ago, and absolutely no problems, and we have has some heavy rain
Date published: 2019-10-23
Rated 5 out of 5 by from Worked Great!!!! Bought just to see how it would seal our concrete goldfish pond. Excellent job!!!!!
Date published: 2019-10-23
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The following steps and products are required.

  • New concrete must cure for a minimum of 30 days.

  • Remove old coating or sealer, if present, using KILZ Concrete & Masonry Paint Stripper.

  • Remove mildew stains, if present, with KILZ Concrete and Masonry Cleaner & Degreaser.

  • For optimal penetration and adhesion, use KILZ Concrete & Masonry Cleaner & Etcher to clean and etch the surface. Testing Surface Preparation: Sprinkle a few drops of water onto the surface. If water is quickly absorbed, the surface is ready. If not absorbed, re-etch.


  • DO NOT DILUTE. Stir or shake before applying.

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

  • Apply until saturated by brush, roller or garden sprayer to a dry surface.

  • For roller application please use nap size 3/8" to 1/2" for smooth and 3/4" for rough surface.

  • Remove any puddles by spreading product to drier areas or by wiping up excess with a clean cloth.

  • On vertical surfaces, apply from the bottom up and saturate well.

  • COVERAGE: 250 sq. ft.

Dry Time

  • Allow surface to dry 24-48 hours, depending on temperature and humidity.

  • Once dried, rough, vertical surfaces may be coated with an oil or latex-based paint or primer. Do not paint horizontal surfaces after applying this product.

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.


  • Protect from freezing.

  • Do not use on coated or previously sealed floors.

  • For best results, apply at temperatures between 50°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.

  • Masonry with pH Levels up to 13.0.

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


  • Int/Ext


  • Color


  • Coverage Rate

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

  • Coverage - Low

    250 sq. ft.

  • Mils Wet


  • Mils Dry


  • Coverage High

    250 sq. ft.

  • Mils Wet


  • Mils Dry


  • VOC

    120 g/L

  • Volume Solids


  • Weight Solids


  • Viscosity

    25-35 sec, #1 Zahn Cup

  • Flashpoint