Waterproof interior, exterior, above or below grade walls including basements, retaining walls, and bare concrete swimming pools, foundations, and more. For fish ponds, we recommend using DRYLOK® Original. For floors, we recommend DRYLOK® Floor & Wall.
- GUARANTEED to stop water – withstands 15 pounds of hydrostatic pressure (PSI), equivalent to a wall of water 33 feet high
- Fully transferable 15 Year Warranty
- Withstands cat 4 hurricane winds
- Helps protect against radon gas penetration by reducing vapor transfer
- Green Wise® Certified
- Low-odor formula complies with all current VOC requirements
- Breathable film will not trap moisture in the masonry
- Easy cleanup with warm, soapy water
- 2 Ready-mixed, smooth finish colors
- Features Flexible Encapsulated Polymers for the ultimate in waterproof protection
- Incorporation of a green biocide helps the dry paint film resist mildew growth
- Sizes: quart, gallon, 5 gallon
- Coverage: 75-100 square feet per gallon
- No pre-mixing or pre-wetting
- Application tools: brush or roller (preferred for first coat), sprayer
- Dry time: 2-3 hours
- Coats: minimum of 2 for Warranty Coverage to apply
- Recoat time: 2 hours
- After 24 hours, DRYLOK® will accept a decorative topcoat using a good quality latex paint
- Masonry walls
- Cinder and concrete blocks
- Poured concrete
Please note, colors are RGB web approximations of the actual shades.
Please note, colors are RGB web approximations of the actual shades.
How To / Videos
Proof of Performance: ASTM Testing
- ASTM D 16 – Standard Terminology for Paint, Related Coatings, Materials and Applications.
- ASTM D 1653 Method A (Dry Cup) – Standard Test Methods for Water Vapor Transmission of Organic Coating Films.
- ASTM D 6904 – Standard Practice for Resistance to Wind-Driven Rain for Exterior Coatings Applied to Masonry.
- ASTM D 7088 – Standard Practice for Resistance to Hydrostatic Pressure for Coatings Used in Below Grade Applications Applied to Masonry.
DRYLOK® Extreme 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.
Fully Transferable 15 Year Warranty
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 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.