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DRYLOK® Extreme Concrete & Masonry Waterproofer

If water is leaking through existing masonry or you need to protect new construction from water infiltration, our proprietary formula is GUARANTEED to stop water.


Please note, colors are RGB web approximations of the actual shades.


Additional colors obtained with tint. Visit your local DRYLOK® dealer for more information.
Please note, colors are RGB web approximations of the actual shades.

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Product Overview

A versatile masonry waterproofer that can be applied interior, exterior, above or below grade. Guaranteed to stop water up to 15 psi and resists cat 4 (140+ mph) hurricane winds. Resists mildew on the dry paint film.

Coats: Minimum 2 coats

Clean up: Soap and Water

Coverage: 75 – 100 square feet per gallon

Dry Time: 45 minutes to touch, 2 – 3 hours to dry, 2 hours to recoat

Warranty: Fully transferable 15 Year Warranty

  • Bright white flat, smooth
  • Latex base
  • Semi-Impermeable coating - keeps water and vapor out (<1 perm rating)
  • Can be top coated after 24 hours
  • Tintable
  • Application by brush, roller, or sprayer
  • Reduces radon gas penetration
  • CSI Masterformat® 07 14 16 Cold Fluid-Applied Waterproofing
  • CSI Masterformat® 07 19 00 Water repellents
  • CSI Masterformat® 09 91 13 Exterior Painting
  • CSI Masterformat® 09 91 23 Interior Painting
Click to expand / collapse
  • Masonry walls
  • Brick
  • Stucco
  • Cinder and concrete blocks
  • Poured concrete
DRYLOK Masonry Waterproofer
DRYLOK® Masonry Waterproofer Overview
How to DRYLOK Old Stone Basement Walls
How to DRYLOK® Old Stone Basement Walls
Contractor Case Studies
DRYLOK® Professional Case Studies
How to Waterproof a Basement
How to Waterproof a Basement with DRYLOK®

DRYLOK® Extreme Concrete & Masonry Waterproofer may be applied on a slightly damp surface, but best results are obtained when the surface is dry, clean and free of grease, oil, form-release compound, and paint. Remove dust, dirt, and any loose or broken mortar with a wire brush. Old paint in poor condition should be removed by wire-brushing, sandblasting or other suitable methods.* If you see white, powdery, crystal-like deposits on the surface, they are naturally-occurring, water-soluble salt compounds in the masonry, pushed out by water intrusion. When the water evaporates, the salt residue remains. This effect is called efflorescence and, because it prevents DRYLOK® Extreme Masonry Waterproofer from properly bonding to the surface, it must be removed. Treat it with DRYLOK® Etch** (liquid or powder formula) or muriatic acid according to the manufacturer’s directions, rinse, and allow the surface to dry. Since efflorescence occurs naturally, we cannot warrant against it reoccurring.

Patch all cracks and holes with DRYLOK® Fast Plug®. Wet the surface to be patched. Next, back chisel the areas to be patched in the shape of an inverted V” so DRYLOK® Fast Plug® can better anchor into the wall. Apply and smooth the patch so it’s even with the surface around it. As DRYLOK® Fast Plug® sets rapidly, mix only what you’ll use in 3 – 5 minutes. Also, be sure to seal the area where the floor and wall meet. Often, when concrete floors cure, they shrink and pull away from the wall, creating a space where water can enter.


Schedule your project when both air and surface temperatures are 50°F or higher and, for best results, wait for a dry (rain-free) period. Stir DRYLOK® Extreme Masonry Waterproofer thoroughly before and during application — do not thin. Apply the first coat to bare masonry with a three-quarter-inch nap roller, a DRYLOK® Brush or a quality nylon bristle brush. If using a brush, work the DRYLOK® Extreme Masonry Waterproofer into the pores of the masonry, making sure to fill all pores and pinholes. If using a roller, back brush the first coat to fill all pores and pinholes. Give the first coat two to three hours to dry, and then apply a second coat using a roller, brush, or sprayer (Download our Spray Specs).

Proper coverage, a minimum of 2 coats, is required to warranty waterproofing. After the second coat, carefully inspect the entire surface for pinholes. Give these areas an additional coat. If leaking is still present after 2 coats, it indicates that pores or pinholes are still open. Paint these areas again.


Dispose of contaminated absorbent, container and unused contents in accordance with local, state and federal regulations.


United Gilsonite Laboratories (UGL®) warrants DRYLOK® Extreme Masonry Waterproofer, when applied according to directions on a properly prepared bare masonry surface, will provide a waterproof coating for fifteen (15) years from the date of application, warranty includes subsequent owners. There are no other warranties that extend beyond this warranty. This warranty shall not apply when the waterproofer fails due to improper product application, failure to follow label directions, inadequate surface preparation, cracked structural surfaces, reoccurring efflorescence or any conditions not foreseen by UGL. Two coats of DRYLOK® Extreme Waterproofer are required to ensure warranted waterproofing. Label directions are as complete as possible, but cannot encompass all conditions, applications and/​or surfaces. In the event that the coating fails, your remedy is limited to either replacement of the product purchased or refund of the purchase price. This is the exclusive remedy. For warranty fulfillment, return used product container and sales receipt to UGL, Technical Customer Service, 1396 Jefferson Ave., Dunmore, PA, 18509. THIS LIMITED WARRANTY EXCLUDES ALL OTHER EXPRESS OR IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FORPARTICULAR USE OR PURPOSE. UGL will in no event be liable for any incidental or consequential damages. Some States do not allow limitations on how long an implied warranty lasts or the exclusion or limitations of incidental or consequential damages, so the above limitations or exclusions 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.


Q. How can you tell if a surface is too wet to paint?

A. Rub your fingertips over the suspect area. If they are wet, do not paint the surface.

Q. How long will DRYLOK® Masonry Waterproofer maintain its effectiveness?

A. When applied according to directions, DRYLOK® Original Masonry Waterproofer is warranted for 10 years, DRYLOK® Extreme Masonry Waterproofer is warranted for 15 years, and DRYLOK® Floor & Wall Masonry Waterproofer is warranted for 7 years. In many instances, these products will provide many additional years of satisfactory performance.

Q. What is the coverage of DRYLOK® Masonry Waterproofer?

A. Both DRYLOK® Original Masonry Waterproofer and DRYLOK® Extreme Masonry Waterproofer cover 75 – 100 square feet per gallon, and DRYLOK® Floor & Wall Masonry Waterproofer covers 90 – 100 square feet per gallon, depending on the porosity of the surface.

Q. Can DRYLOK® Masonry Waterproofer be used on floors?

A. DRYLOK® Extreme and DRYLOK® Original Masonry Waterproofers are not formulated for floors. You can use DRYLOK® Floor & Wall Masonry Waterproofer on floors and walls. It holds up to foot traffic as a finished coat and can be used before applying floor paint, or latex-based adhesives.

Q. Can DRYLOK® Masonry Waterproofer be used over paint?

A. Yes and no. DRYLOK® may be used over any other cementitious-type waterproofing paint in good, repaintable condition, either inside or outside. However, DRYLOK® cannot be used over an oil or latex-based paint on the inside of a building. DRYLOK® will adhere to these paints, but if it cannot penetrate into the pores of the masonry itself, it will not waterproof the surface.

Q. Can DRYLOK® Masonry Waterproofer go over wood, metal or terra cotta?

A. DRYLOK® Masonry Waterproofer is not recommended for use on anything other than bare masonry and concrete surfaces. It can be applied to porous terra cotta, concrete, stucco, and cement.

Q. Can DRYLOK® Masonry Waterproofer be used as an outside foundation coating?

A. Yes, DRYLOK® Masonry waterproofer is ideal as a foundation waterproofing coating. Wait 24 hours after the application of the second coat to backfill.

Q. Can you paint over DRYLOK® Masonry Waterproofer?

A. Absolutely. In fact, DRYLOK® makes an ideal base coat. After applying DRYLOK®, wait at least 24 hours and then paint it with a good quality latex top coat.

Q. I’m press for time. Can I use DRYLOK® Masonry Waterproofer as an all-in-one primer and paint?

A. Yes! Plus, in addition to being a terrific timesaver, DRYLOK® is available in a range of colors to help you add personality to your basement, workshop, laundry room, and other living areas. DRYLOK® Original Masonry Waterproofer’s sandy finish is available in 4 ready-mixed colors (blue, white, gray, and beige) and 6 tints (buttercup, mint green, platinum, sand, slate blue, and soft pink). If you prefer a smoother finish, choose DRYLOK® Extreme Masonry Waterproofer, available in bright white and an expanded tint palette (beige, blue, buttercup, gray, mint green, platinum, sand, slate blue, and soft pink).

Q. Can DRYLOK Extreme be used on fishponds?

A. No, the biocide in DRYLOK® Extreme that prevents mold and mildew growth may harm aquatic life. We recommend using DRYLOK® Original on fishponds.

USAGE STATEMENT: Prior to use, carefully read the product label and follow the directions. For technical information, warnings, cautions, notices, and additional information, download and read the documentation available on this website.

California Residents: Prop 65 WARNING(S)

* WARNING: 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 respirator 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 visit www​.epa​.gov/lead.

** When using DRYLOK® Etch®, wear eye protection with side shields, chemical-resistant gloves, protective footwear and suitable clothing.

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