THINGS TO REMEMBER WHEN USING LIQUID RUBBER

1) Catalyst must be added prior to use. Scrape sides of container with a Liquid rubber spatula to ensure catalyst distribution.
2) Xylene or Mineral Spirits Solvents may be added to adjust viscosity or for clean-up.
3) Easiest way to spread the rubber on a flat surface is to broadcast material with a rubber squeegee then roll using a short nap roller. Product is self leveling. A flat spatula can be used for small areas.
4) Product has a long pot life after catalyst has been added; 4-6 hrs. depending on temperature.
5) Only temperature affects the rate of cure. Relative humidity has no influence.
6) Product is hydrophobic (sheds water) so substrate to be coated must be dry initially. The uncured rubber can get wet or even have ponding water, with only a cosmetic effect after application, and will still cure.
7) The rubber will penetrate into porous substrates such as wood and poured concrete. A primer/sealer should precede application of liquid rubber.
8) The chemical reaction of the catalyzed rubber can be arrested by freezing the material. This can keep material usable for weeks or months. To use again simply allow it to reach room temperature and apply.

Liquid EPDM and its benefits

The EPDM roofing association which started in 2002 has always focused on educating contractors and the roofing community on the characteristics and benefits of EPDM membranes. Their studies have concluded that EPDM’s service live is over 20 years. Arguably the most important benefit of an EPDM system is the membrane’s flexibility. A growing number of contractors are specializing in EPDM installation, due to its low callbacks and insurance premiums. EPDM roofing systems also feature low maintenance, easy repair options and low annualized costs.

With Liquid EPDM there is No cutting, No gluing and No Seaming! EPDM Liquid Rubber® totally eliminates the problems encountered with single ply materials because it produces a seamless membrane which is all of the same chemistry. So what do we gain by using EPDM Liquid Rubber®? It eliminates seam failures and eliminates shrinkage of the single ply rubber. It also prevents further chalking particularly with white EPDM and it extends the life of a roof. Liquid Rubber®, available through Epdmcoatings.com is the only EPDM in Liquid form. This product is a high solids solution of sheet EPDM Rubber. It converts from liquid to solid elastomer via a unique free radical cure mechanism which works at temperatures of 55° F and higher. EPDM Liquid Rubber® can be applied directly on many types of substrates that have solid, stable, non-porous and uniform surfaces such as flat roofs. For most substrates, primers are not necessary. As an example, some types of substrates that can be coated with EPDM Liquid Rubber® without a primer are:

• EPDM Rubber Membrane on flat or sloped Roofs
• Weathered Steel Siding
• Outstanding barrier for salt-water environments
• Weathered Fiberglass
• Weathered standing seam and corrugated metal roofs
• Weathered Vinyl, PVC and Polycarbonate plastic
• Foam insulation for pipe
• Cast Concrete foundations

Liquid Rubber® may be applied at any temperature that permits it being spread onto the surface. It will waterproof immediately upon application. The solvent will evaporate at a rate governed by temperature but will not be affected by relative humidity. Exposure to freezing temperatures before cure has taken place will not damage the film. The time necessary to reach cure should not be a concern as this process will occur automatically. Exposure to sunlight will accelerate the curing process. The final film properties of the cured membrane will be the same regardless of the time required to achieve cure.

EPDM Liquid Rubber® will provide long term protection even under extreme exposure conditions. It is resistant to temps of 300 degrees F and minus 62 F. Liquid rubber is water resistant even in an uncured state. An unexpected rain shower shortly after application will not wash it off. The slow cure and non-polar nature of EPDM Liquid Rubber® gives it outstanding surface wetting properties. The product does not fill cracks and crevices but will produce an even film penetrating even the smallest surface irregularities. When EPDM Liquid Rubber® is applied over porous surfaces such as poured concrete, pinholes will appear on the surface as the material slowly displaces the air in the pores. This surface wetting feature enables the product to be applied in a SINGLE COAT and the still results in complete film integrity. EPDM Liquid Rubber® can be applied to hot surfaces encountered during the summer. The solvent in the system will flash off rapidly but the polymer will remain soft long enough to permit overlapping even after 1-2 hours. The cure rate is still controlled even at temps up to 120 degrees. The product can, therefore, be applied on the hottest day.

The controlled cure rate also results in a longer pot life, giving the applicator more than adequate length of time (4-6 hours depending on temperatures) to use the mixed quantity of material. Adhesion will increase over time. Polar surfaces such as metal, concrete and wood result in stronger adhesion than non-polar surfaces such as asphalts. Most weathered surfaces including single ply and thermoplastic membranes will have enough of a surface profile to anchor the EPDM Liquid Rubber®

By itself, the EPDM Liquid Rubber® membrane will exhibit the characteristics of its EPDM chemistry i.e. U.V. ozone stability, excellent ponding water resistance and long-term retention of flexibility. EPDM Liquid Rubber® applied over generally sound singly ply EPDM can extend its life another 20 years. The useful life of metal roofs will also benefit greatly when EPDM Liquid Rubber® is applied. It is recommended that a corrosion inhibitive primer first be applied to areas where severe rusting has occurred. EPDM Liquid Rubber® does not contain any corrosion inhibiting pigments but it is such an effective moisture barrier that it can be applied directly over light rust without a primer. For more information contact EPDM Coatings or call at 855-281-0940. They also have a blog filled with discussions from customers as well as valuable information on the product at http://liquidroof.blogspot.com/

Application of liquid rubber coatings

Application of Liquid Rubber Coatings Starts with Preparing the Surface

The application of liquid rubber coatings is easiest when the surface is flat, clean and smooth. As is the case with all painting jobs, the most time-consuming part could be cleaning and repairing the surface.

How to clean the surface depends on the material. For metal roofs, sweeping and/or washing may be all that is necessary. You should make sure there is no debris on the surface, because any debris will show through the coating.

Concrete floors should be as smooth as possible. If cracks or holes are present in any material, fill them with a non-silicone based caulking. The rubber would fill the hole, but a dent would still be visible. Depending on the depth of the hole, this could cause a variety of problems in the future.

For some older roofing materials, it is a good idea to reinforce the surface with butyl tape and polyester fabric. For example, if there are gaps, tears or other defects, you would want to correct those problems. Although the coating does not adhere to all materials, it does adhere to fabric.

Rubber Liquid

Depending on the surface to be covered, a catalyst coating may be needed. For example, the application of liquid rubber coatings to existing asphalt-based roofs requires a pre-coating with an elastomeric catalyst. Follow the manufacturer’s directions concerning what type of pre-coating to use.

Generally speaking, latex house paint is not an acceptable solution.

You will need a squeegee, a roller and a paint brush to apply the coating, once the surface has been prepared. The thickness usually recommended for the coating is 20-mil. It may be necessary to do a spreading rate calculation to get an idea of how that thickness can be achieved. A good estimate for a flat smooth surface is 40 feet per gallon. The application of liquid rubber coatings to uneven surfaces will require more.

The product needs to be spread as evenly as possible. You want to avoid making it thicker in some spots and thinner in other areas. The squeegee is used initially to spread the material. It is recommended to follow the use of the squeegee with a roller to promote more even distribution and get rid of any air bubbles that may be trapped within the liquid.

The first 2 gallons usually take one or two hours to apply. If you have already determined how many gallons you need, this should give you an idea of how long the application of liquid rubber coatings will take. You should be able to get the job done in a day.

Technical Aspects of EPDM

Elastomeric coatings are roofing applied in a viscous state. It has elastic properties, and can stretch in the summer time heat and then return to their original shape without damage.

Elastomeric coatings usually contain polymeric materials, such as acrylic, and a white pigment, such as titanium dioxide, to make them opaque and reflective. An elastomeric coating is applied thicker than paint. An elastomeric coating can be used on virtually any substrate including asphalt built-up roofing, concrete roofing, metal roofing, modified bitumen roofing, polyurethane foam roofing and single ply roofing.

Since EPDM Liquid Rubber Coatings cures by chemical reaction, a single heavy application will be preferable to multiple thin coats. A second coat will bond to a previous film but that bond will not be as strong as the internal bond within each layer. If a second coat is applied before the first has thoroughly cured, some wrinkling may result as the first coat absorbs solvent and swells. This will, however, recover as the solvent evaporates. It is generally recommended that only a single coat be applied over non-porous surfaces, the thickness of which can be varied as desired. Thicker films will take longer to cure through. Asphalt coatings and asphalt built-up roofs are considered unstable substrates and therefore, not recommended for coating directly with Liquid Rubber EPDM. EPDM COATINGS do carry a specific elastomeric which with a two coat application gives you a 10 year warranty.

Liquid Rubber is designed to re coat structurally sound existing roof and protective materials. They are also best for RV Roof Repair. They should not be used in place of roofing membranes”.

The following are recommended substrates to coat:

  • Metal – Coated or Galvanized Steel
    • Weathered Aluminum
    • Weathered Copper
  • EPDM Rubber membrane
  • Concrete (except foot traffic surfaces)
  • Urethane Foam
  • Primed Wood
  • Fiberglass
  • PVC Sheet and Pipe
  • Acrylic Sheet
  • Sponge Rubber insulation

Do Not use Liquid Roof or Liquid Rubber on the following substrates:

  • Built up asphalt roofs
  • Asphalt shingles
  • Modified asphalt roll roofing
  • Stainless steel
  • Glass
  • Silicone caulk
  • Foot traffic surfaces
  • Hypalon Membrane

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

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.

Durability:

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