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DRYLOK® Masonry
A wet basement can be one of the toughest problems to deal with as a homeowner. You can prevent future property damage by using DRYLOK® Masonry Waterproofer. Most people don't know that DRYLOK Masonry Waterproofer has been tested to hold back a wall of water 22 ft high (10 psi). After a hurricane, or severe storm has hit, first pump out the water, and dry the space. Next, follow the steps below so that you'll be prepared for the next storm!

Step 1: Prepare the Surface

Clean the surface thoroughly with a wire brush to remove any loose or broken mortar and dirt from the surface to be painted.

WARNING! If you scrape, sand or remove old paint, you may release lead dust. LEAD IS TOXIC. Contact the National Lead Information Hotline at 1-800-424-LEAD or log on to

If you see white, powdery deposits, this is efflorescence that must be removed. Efflorescence is naturally occurring, water-soluble salt compounds that are in the masonry and are drawn to the surface by water seepage. These deposits prevent the masonry waterproofing paint from adhering to the surface of the wall.

Treat efflorescence by washing with a solution of DRYLOK® Etch® (liquid or powder formula) or muriatic acid according to manufacturer's directions, rinse and allow to dry. Since efflorescence occurs naturally, we cannot warrant against recurring efflorescence. If efflorescence is not present, proceed to Step 2.

Step 2: Patch Cracks and Holes

Fill all holes and cracks with DRYLOK® Fast Plug®. Wet down the area prior to patching to help DRYLOK® Fast Plug® cure properly. To allow the patch to expand and lock into the surface, back chisel the area to be patched to the shape of an inverted "V".

Fast Plug® sets up rapidly, so only mix enough patch to be used in 3 to 5 minutes.

Seal The Floor And Wall Joint.
When patching, don't forget the area where the floor and wall meet. Often, when concrete floors cure, they shrink and pull away from the wall, allowing a space for water to enter. Fill this area as described above.

STEP 3: Apply DRYLOK To Masonry Walls

Stir DRYLOK thoroughly before and during application. Apply DRYLOK Masonry Waterproofer to the cleaned surface when the air and surface temperatures are above 50 degrees F. For best results wait for a rain-free period. Apply using a 3/4" nap roller, DRYLOK Brush or good quality nylon bristle brush. If rolled, back-brush the first coat to fill any pinholes in the masonry. If brushed, work the DRYLOK into the pores of the masonry, making sure to fill all pores and pinholes.

Proper coverage is important for waterproofing. 1 gallon covers a 8 ft x 10 ft area. A minimum of two coats is required to assure warranted waterproofing. Allow the DRYLOK® to dry according to manufacturer's direction between coats.

Important: After the second coat, inspect entire wall surface for pin holes in the waterproof coating. Any areas with pin holes should be painted with an additional coat to ensure waterproofing results. For a decorative finish, you can apply a good quality latex paint over the coated surface after 24 hours.