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 4.8 out of 5 by 21.
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
Rated 4 out of 5 by from sasy to use good to use,. easy to use,.,.,.,.,.,,.,.,.,.,.,.,.
Date published: 2019-10-23
Rated 5 out of 5 by from Great protection Bought ths many times and I continue to use on all my concrete
Date published: 2019-09-08
Rated 5 out of 5 by from Great coverage My basement recently flooded during a flash flood and water was seeping through cracks in my concrete foundation that I didn't even know were there. I filled the cracks with caulk and used this product as a finishing waterproof barrier. I covered the walls with 2 coats of paint and haven't had any issues since. Coverage was great and the walls look fresh and clean.
Date published: 2019-08-19
Rated 4 out of 5 by from EASE ITS EASY TO USE AND WORKS, will purchase again soon
Date published: 2019-08-19
Rated 5 out of 5 by from perfect for homeowners worked good on my basement walls to stop water from coming in
Date published: 2019-03-28
Rated 5 out of 5 by from Easy Waterpoofing Indoors and Out! Finishing my basement, worked as a sealant on concrete block walls and slab floor. Paired with the cleaner/etcher first your room will look brand new! If you know how to paint a wall you can easily use this product, best of all its affordable for everyone and never has to be redone! My basement room went from musty and dark to white, fresh, moisture free and livable again. Thanks kilz for finishing my basement!
Date published: 2018-10-17
Rated 5 out of 5 by from Works exactly as designed. Product was easy to work with. Also, it sealed and protects to extend the life of any concrete object.
Date published: 2018-09-28
Rated 4 out of 5 by from Great product Bought this for my basement. More than worth the price. Protected my walls beyond my expectations. Color was nice and bright. Highly recommend.
Date published: 2018-09-11
Rated 5 out of 5 by from This is great stuff. I used it in my crawl space below my house. It killed the musty odor and the space is much brighter.
Date published: 2018-08-03
Rated 5 out of 5 by from This is a very good product I used this on my outside cellar wall. It went on very nicely, didn't clump and dried quickly. I would recommend this to anyone.
Date published: 2018-07-19
Rated 5 out of 5 by from Kilz concrete Kill concrete for waterproofing my basement was easy to apply and it's been seven years since I applied and no leakage.
Date published: 2016-07-20
  • y_2020, m_1, d_28, h_18
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.4
  • cp_2, bvpage2n
  • co_hasreviews, tv_0, tr_21
  • loc_en_US, sid_L3901, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_kilz
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 204ms


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