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Click for Block & Wall Liquid Rubber
Sku numbers

Ames'® Block & Wall Liquid Rubber

One or more of the following:

  • 4-inch wide paintbrush
  • Utility knife
  • caulking gun for filling cracks
  • Seam Tape or Roof Fabric
  • 3/8" to 1/2" nap paint roller
  • Commercial airless sprayer


1 gallon = 100 sq. ft.
5 gallons = 500 sq. ft.
55 gal. drum = 5500 sq. ft.
275 gal. tote = 27500 sq. ft.

Clean up tools and small spills with water.

Do-It-Yourself In Three Easy Steps
All specifications are suggestions only.

1. Clean and Prepare the Surface
Be sure that surfaces are clean and dry before the coating application. Powerwash thoroughly, if needed. Brush, trowel, or caulk all cracks greater than 1/8” wide with Blue Max™ trowel-grade coating and filler.  Install adequate drains to drain flat roofs. Always run a test patch first in an inconspicuous area. This is to ensure that there is proper adhesion and drying, and that the product performs to your satisfaction. Check our website at www.amesresearch.com for the latest updates before proceeding with the application. Shake or stir Block & Wall Liquid Rubber before using.

2. Seam Tape & Prime the Surface
Surfaces with joints, cracks, flashings, vents, parapet wall flashings or where two unlike surfaces come together, require Ames' Peel & Stick Seam Tape (PS250, PS450 or PS650) to provide some additional strength and reinforcement. Prime all surfaces generously with Block & Wall Liquid Rubber prior to setting the Seam Tape in place. (See Seam Tape label for instructions.) Apply a liberal topcoat of Block & Wall Liquid Rubber or Blue Max over the Seam Tape and allow to cure.

3. Just Paint or Spray It On
Apply Block & Wall Liquid Rubber to the surface. For a complete application we recommend one gallon per 100 square feet for walls, and three to four gallons per 100 square feet for cisterns and tanks, or as needed. Block & Wall Liquid Rubber is slightly tacky and may be topcoated on roofs with Maximum-Stretch, and on basement walls and foundations with Block & Wall or Paint & Prime. When used on roof decks Block & Wall Liquid Rubber is topcoated with Safe-T-Deck.

The following instructions are some suggested methods of application that may work for you on your waterproofing project.

Concrete Walls & Foundations

  1. The surface must be clean, dry, and free of loose material. Fill all joints or cracks wider than 1/8 inch with Blue Max™ trowel-grade filler. 
  2. It is important to seam tape all joints and cracks to avoid future cracking and leaking. Seam tape flashing to wood; wood to wood; concrete to wood; metal to wood; brick to wood; etc. 
  3. Block & Wall Liquid Rubber may be brushed, rolled or sprayed. We recommend two gallons per 100 square foot for walls. The application must be applied in a continuous, unbroken seal of a minimum dry thickness of no less than 30 mils (the thickness of a dime).

Cisterns & Water Tanks

Block & Wall Liquid Rubber makes an excellent sealant for waterproofing cisterns, water storage tanks, and ponds.  Block & Wall Liquid Rubber is non-toxic, low VOC, environmentally friendly and can be used as a potable water coating.

  1. The surface must be clean, dry, and free of loose material. Fill all joints or cracks wider than 1/8 inch with Blue Max trowel-grade filler.
  2. It is important to seam tape all joints and cracks to avoid future cracking and leaking.
  3. Block & Wall Liquid Rubber may be brushed, rolled or sprayed. Apply three to four gallons per 100 sq. ft. in a continuous unbroken film with a minimum of no less than 30 mils (the thickness of a dime).

Plywood, Underlayment, OSB siding and roofs
Use Block & Wall Liquid Rubber as a vapor barrier on plywood, underlayment, O.S.B. siding and roofs. Block & Wall Liquid Rubber penetrates and seals wood to a watertight condition. Seam Tape all joints and coat with 1 gallon per 100 square feet of Block & Wall Liquid Rubber. Seam tape all seams before coating.

Sprayer Instructions and Thinning
Thin with water up to 10% or as needed for spraying. Use a .0030 reversa tip with a  commercial sprayer. We recommend a 3/8 inch hose for commercial applications. Apply by brush, roller, or texture sprayer for smaller applications.

Weather & Drying Guidelines
For exterior applications this product is best applied between 55 to 90 degrees F on warm dry surfaces.  Be sure humidity is less than 50% and dew point and temperature have a ten degree spread.  Block & Wall Liquid Rubber will begin to dry in 30 minutes to two hours depending upon thickness of the application and the weather.  It continues to cure for up to two weeks.  A slight tack is normal after drying. Block & Wall Liquid Rubber may be recoated or topcoated when it is dry to the touch.

Important: For exterior applications check your local weather forecast and follow our Ames‘ Weather Rule: Apply when the streets are dry, the sun is in the sky, the surface is warm to the touch, and no inclement weather is forecast for 24 hours.  Consult your local weather forecast. The best work window during winter months is usually between 10:00 am and 2:00 pm with a forecast of clear weather for the following day. Low temperatures, high humidity, evening and morning dew will require increased drying/curing time. 

When topcoating Block & Wall Liquid Rubber, keep in mind that white or light colored coatings will reflect nearly all solar rays and dry at a much slower rate than dark colored coatings. If you live in the northern hemisphere the best time to apply white products is the summer months when there is plenty of sunlight. In contrast, darker coatings absorb more sunlight and dry more quickly. During the winter, Blue Max dries faster with sun contact and may be substituted for Block & Wall Liquid Rubber.

Clean-Up, Storage, and Disposal
Clean tools and small spills with water. Store unused product in its original container, tightly sealed and protected from freezing. Dispose of this product in accordance with local, state, or federal requirements.

Estimated Coverage
Standard product coverage on a smooth surface is 100 sq. ft. per 1 gallon, per coat (est. 10 mil).  More than one coat is recommended. More coats equal longer life. Rough surfaces will require additional product and drying time. Average application rate is two gallons per 100 sq. ft., or 20 gallons per 1,000 sq. ft, or 2 coats.

First Aid / Caution
Keep out of Reach of Children. If swallowed, do not induce vomiting. Give milk or water and seek medical attention immediately. In case of contact with eyes, flush thoroughly with water and call a doctor or poison control center. This product contains a unique combination of waterbase acrylic and rubber co-polymers. Call 911 for the poison control center. Repeated or prolonged contact with skin may produce irritation or sensitivity. Use gloves.  

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