DRYLOK® Clear Masonry Waterproofer

DRYLOK® Floor & Wall Masonry Waterproofer

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

Unlike ordinary paint that simply adheres to a surface and can be forced off by incoming water pressure, DRYLOK® Floor & Wall Masonry Waterproofer actually penetrates the pores in that surface, bonding to the masonry and creating an impenetrable barrier.

DRYLOK® Floor & Wall Masonry Waterproofer Application

Fully Transferable 7 Year Product Warranty Resists Wind Driven Rain Resists 98 mph Hurricane winds


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Quick Overview

Waterproof interior, exterior, above or below grade walls. DRYLOK® Floor & Wall Masonry Waterproofer is also perfect for floors, basements, retaining walls, decorative brick and stone facades, and more.

  • GUARANTEED to stop water – withstands 4 PSI
  • First clear (non-pigmented), abrasion-resistant, high-gloss waterproof coating approved for floor and wall applications
  • Fully transferable 7 Year Limited Warranty
  • Patent-pending formula
  • Creates a moisture vapor barrier on floors as a finish coat or under latex paint or as a primer prior to applying floor coverings
  • Protects against 98 mph wind-driven rain on decorative vertical surfaces
  • Complies with current VOC requirements
  • Reduces radon gas penetration
  • Resists wear from foot traffic
  • Not intended for use with vehicle traffic

Product Features:

  • Clear, high-gloss finish
  • Protection level: 31%±2% solids
  • Sizes: gallon, 5 gallon
  • Coverage: 90-100 square feet per gallon
  • No pre-mixing or pre-wetting
  • Application tools: brush or roller (preferred for first coat), sprayer
  • Dry time: 2 hours
  • Coats: minimum of 2
  • Recoat time: 2 hours
  • Easy cleanup with warm, soapy water



  • Concrete floors
  • Masonry walls
  • Brick
  • Stone
  • Split face blocks


Proof of Performance: ASTM Testing

  1. ASTM D 16 – Standard Terminology for Paint, Related Coatings, Materials and Applications.
  2. ASTM D 1653 Method A (Dry Cup) – Standard Test Methods for Water Vapor Transmission of Organic Coating Films.
  3. ASTM D 6904 – Standard Practice for Resistance to Wind-Driven Rain for Exterior Coatings Applied to Masonry.
  4. ASTM D 7088 – Standard Practice for Resistance to Hydrostatic Pressure for Coatings Used in Below Grade Applications Applied to Masonry.


DRYLOK® Floor & Wall 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® Floor & Wall 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. Proceed to 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 and, so DRYLOK® can better anchor itself into the wall, back chisel the areas to be patched into shapes like an inverted “V”. 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 to 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.

Floor Preparation
Highly troweled or extremely smooth concrete floors must be acid etched or mechanically abraded to achieve the proper profile. Treat the surface with DRYLOK® Etch®** (liquid or powdered) or muriatic acid, according to the manufacturer’s directions. A properly prepared concrete floor should look and feel like medium grit sandpaper. Repeat the etching procedure until the proper texture is achieved.

Test the concrete’s porosity and check for residual sealers by sprinkling a few drops of water on surface. If the water does not readily penetrate into the prepared concrete, additional acid etching is required. Remove any residual acid etching material from the surface, rinse it thoroughly and allow it to dry.

To check for trapped moisture, affix a 12” x 12” piece of 3 mil plastic or aluminum foil to the surface, taping it tightly along all four edges. Remove it after 24 hours. If the surface side of the plastic or foil is damp, allow additional drying and repeat the test.


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® thoroughly before and during application - do not thin. The product will appear milky in the can but it dries clear. Apply the first coat to bare masonry with a three-eighths-inch nap roller (19 mm), a foam roller, a DRYLOK® Brush, a good quality nylon bristle brush, or a sprayer. If using a brush, work DRYLOK® Floor & Wall Masonry Waterproofer into the pores of the masonry. If rolling or spraying, back brush if necessary to fill in all the pores and pinholes. Give the first coat 3 hours to dry, and then apply a second coat using a roller, brush or sprayer (download our Spray Specs).

For proper coverage, a minimum of 2 coats is required. After the second coat, carefully inspect the entire surface for pinholes. In areas where pinholes are still present, apply an additional coat of DRYLOK® Floor & Wall Masonry Waterproofer. If leaking is still present after two coats, it indicates that pores or pinholes are still open. Paint these areas again.

Floor Application
To achieve uniformity, apply 2 coats of product, making sure to apply the second coat in a cross direction to the first coat. The surface can be subjected to light foot traffic within 4 hours and heavy foot traffic within 24 hours. DRYLOK® Floor & Wall Masonry Waterproofer is not recommended for surfaces that are subject to vehicular traffic. If you plan to cover the surface with flooring or carpeting, allow the final coat of DRYLOK® Floor & Wall Masonry Waterproofer to dry for 24 hours. Only use water base adhesives when installing flooring. If topcoating, use a water-based paint or coating. Any screws, nails or anchors that penetrate the coating will nullify the waterproofing properties. Lift and place items on floor surfaces to avoid marring.

NOTE: Waterproofed surfaces may become slippery when wet. If slip-resistance is desired, add 2-4 ounces of DRYLOK® Non-Skid Texture Additive to each gallon.


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

Fully Transferable 7 Year Warranty

United Gilsonite Laboratories (UGL®) warrants DRYLOK® Floor & Wall Masonry Waterproofer, when applied according to directions on a properly prepared bare masonry surface, will provide a waterproof coating for seven (7) 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® Floor & Wall Masonry 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, WITHOUT LIMITATION, ALL OTHER EXPENSES OR IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR 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.

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.