Liquid Roof Application

Liquid Roof Application is best with a squeegee and a fine nap roller. Before applying, mix the pre-measured catalyst by following label directions. A single application is preferable to multiple coats. Touchups may be applied as desired after initial film has cured and surface is first wiped with solvent. To insure its effectiveness it must be applied at a 20 mil layer . Apply with brush around flashings and edges using long, slow strokes. On flat surfaces, material can be poured, spread with a squeegee and then evened out with a short nap roller. The Product will level itself when sufficient material has been applied. Liquid EPDM Rubber Roof should not be applied on cream color ALPHA rubber.


Adhesion will increase over time. Polar surfaces such as metal, concrete and wood result in stronger adhesion than non-polar surfaces such as asphalt and single ply EPDM sheet. Most weathered surfaces including single ply and thermoplastic membranes will have enough of a surface profile to anchor the Liquid EPDM Rubber. Liquid EPDM Rubber Roof has proven itself superior to acrylics, urethanes, and other elastomers as a moisture barrier. Due to ultraviolet rays and weather conditions, sealants become brittle and lose adhesion, resulting in leaks. One application of Liquid EPDM Rubber Roof will provide an air and watertight seal that will outlast the original sealant.


By itself, the Liquid EPDM Rubber Roof membrane will exhibit the characteristics of its EPDM chemistry, i.e. U.V. and ozone stability, excellent pounding water resistance and long-term retention of flexibility. However, since it is always applied to an existing surface, the condition of that surface will determine overall life expectancy.
Liquid EPDM Rubber applied over generally sound single ply EPDM can extend its life another 20 years, The useful life of metal roofs also benefit greatly when Liquid EPDM Rubber Roof is applied. BUR systems often have existing problems such as delaminating between layers, buckling and stress cracking. These are further aggravated by wet insulation which often results in severe corrosion and weakening of the metal supporting deck. Projecting a life expectancy for the EPDM Liquid Rubber membrane ultimately comes down to a case by case determination. When the EPDM Rubber membrane is compared to urethanes, acrylics and other elastomers in accelerated weathering and heat aging tests, the EPDM Rubber shows itself to be superior.

Liquid EPDM Roof Coatings are aftermarket products designed to extend life, seal leaks, provide a heat reflective or aesthetic function over existing roof surfaces. Now you too can enjoy the many benefits of a weather-tight EPDM Rubber Roof. Liquid EPDM Roof is a unique form of EPDM rubber. As a liquid, it can conform to any shape of roof, flashing, or protrusion, vertical or horizontal, and can be applied easily with a paintbrush or roller on your roof. Roof repair with Liquid EPDM Roof is now very easy.

Surface Preparation:

Liquid EPDM Roof/Liquid Rubber/Liquid Rubber may be applied on roof decks, gutters, structural steel, air conditioner enclosures, cooling towers, galvanized steel, unit heater flues, smoke stacks and chimneys, fiberglass and non porous masonry surfaces. Surface to be coated should be clean, dry and structurally sound. Fasten loose areas with adhesive (contact cement) or pop rivets. Oil or wax must be completely removed.

All surfaces to be coated should be clean and dry. Remove peeling paint and brittle caulking. Heavy build ups of asphalt roof cement should also be removed. Tighten any loose fasteners and replace those which are severely corroded. Repair or replace roof panels damaged by storms. Remove heavy rust with abrasive discs or wire brushes. Power washes all surfaces to be coated and allow drying thoroughly. Caulk all gaps wider than 1/16 inch which are not expansion and contraction slip surfaces.

Remove loose portions of existing coatings and brittle caulk with scraper and wire brush before using Liquid EPDM. Whatever still has good adhesion may remain to be re-coated.

Rusty or pitted metal should be wire brushed to remove loose oxide. Tightly adhering corrosion may be re coated. Asphalt based aluminum coatings should be removed as much as possible by wire brush or abrasive disc. Roof cement should be removed and replaced with butyl caulk where necessary.

Repair torn rubber by re-gluing loose areas with contact cement. Coat exposed edges with contact cement to prevent solvent absorption from Liquid EPDM Roof/Liquid EPDM Rubber. A rubber patch may be applied over torn area if desired. Remove chalk from white rubber membrane by brushing with a detergent solution followed by a water rinse or working surface with a stiff brush. Smooth metal or plastic surfaces should be roughed up to improve adhesion of Liquid Roof/Liquid Rubber A DE-glossing solvent may work on some plastics.

For Large Commercial Projects: Airless or Air Atomized spraying, Airless equipment needs only one hose from pump to gun but must generate 3500-4000 psi pressure and is limited in the length of hose which can be used because of high pressure drops. Air atomized equipment requires two hoses to the gun making it more cumbersome to maneuver plus the addition of a compressor.

Liquid Roof is the only liquid EPDM Rubber product currently on the market.

Equipment specifications:

PUMP -capable of delivering 3-4 gal/min. at 3500-4000 psi
HOSE if 3/8 inch ID max. permissible length is 150 feet
when using .019 tip

if 1/2 inch ID max. permissible length is 200 feet
when using .21 tip

  • Tony the Roofer

    I quite like reading a post that will make people think. Also, thank you for allowing for me to comment!