Liquid EPDM Rubber



EPDM is a synthetic elastomer made by combining ethylene and propylene with a diene monomer attached. This polymer (when crosslinked) is a very good moisture barrier, resistant to oxidation and UV degradation but its most important property is its ability to tolerate both low as well as high temperatures (from minus 62 to plus 350 degrees Fahrenheit). EPDM rubber is used exclusively for radiator hoses, freezer gaskets and low temperature seals, steam hoses, and rubber roofing membranes. It is also blended with other rubbers to improve their properties. A multitude of products are now better and last longer because of the contribution made by EPDM rubber.

EPDM Rubber Coatings

Liquid EPDM coatings require a lower molecular weight polymer than is used in the molded products mentioned above. But the other and even more important requirement is its ability to cure at ambient temperatures. The development work on liquid EPDM coatings began in 1990 and the following year the first commercially manufactured EPDM coating became available. Numerous incremental improvements were made over the next several years but the most significant improvements resulted after the discovery of several new catalysts. The products now cure faster, produce better film properties, meet the California VOC restrictions, do not need special hazard labeling, have excellent storage stability, and are environmentally friendly.

Liquid Rubber
Order Here

How does EPDM rubber compare to other coating types?

Water resistance

EPDM is better than epoxies, urethanes, acrylics, Polyesters and alkyds at equal film thicknesses and is not affected by continuous immersion.

UV resistance

Equal or better than acrylics, polyesters and Urethanes; much better than alkyds and epoxies.

Temperature tolerance

EPDM is better than all other coating polymers except Silicones. EPDM can withstand live steam as well as cryogenic temperatures.


EPDM is better than all other coating polymers except Silicones. EPDM can withstand live steam as well as cryogenic temperatures.

Chemical Resistance

EPDM has very good resistance to strong alkali’s, concentrated salt solutions, many acids, alcohols and polar solvents such as ketones. EPDM has poor resistance to oils, fats, waxes and hydrocarbon solvents.

Surface tolerance

EPDM coatings will not bond to a surface that is damp with moisture but will bond to an oil or wax contaminated surface. EPDM coatings can also be applied directly to metal surfaces that have tightly adhering corrosion without a primer.

Where can EPDM coatings be used to their best advantage?

The unique combination of properties which EPDM coatings possess can be best utilized when they are applied to the exterior surfaces of stationary structures. Examples are:


Metal, rubber or thermoplastic membrane, fiberglass, urethane foam, cement tile and plywood.

Metal Siding

Can be applied with little or no surface preparation as a one-coat finish on steel buildings.


Concrete Tanks

The excellent water proofing properties of EPDM will reduce or prevent spalling of the concrete in cold climates.

Corrosive/Humid Environments

Exposed structural steel on the interior of industrial buildings with humid or corrosive environments can be coated with minimal surface preparation. Plating operations, smelters, concrete casting operations, dye works, and paper mills are just a few examples. High-density poultry and hog production operations are another good use to protect steel from the corrosive environment produced by manure.


Liquid EPDM coatings are a good choice for exterior spill containment structures because of their excellent weathering and broad chemical resistance properties.

Unsuitable applications for EPDM Coatings

The relatively slow cure and non aggressive adhesion of EPDM coatings make them poor candidates as factory applied finishes or as coatings for products which come in contact with each other during shipment or use. They are also not recommended for environments where they could be exposed to oils, fats, waxes or liquids with similar characteristics.

Environmental impact

EPDM rubber coatings are high solids products which meet the California VOC( volatile organic compounds restrictions. They are not water soluble in their uncured state and do not contain compounds which could find their way into the water supply. The fact that these coatings do not require primers further reduces VOC emissions and potential use of water polluting products. The durability of these coatings also lengthens. The recoat period so that their environmental impact is lessened even.

  • Testimonials

    • R. Patel

      Our roof if now complete. As you know this was a two year project. We have a 25,000 ft roof with numerous other coatings on it. 25% built up with at least 4 coats of elastomeric and 25% metal with a Dicor product that we kept reapplying and the other 50% original metal. We tackled the first two parts using your proflex primer and then the liquid epdm rubber. After two years it passed with flying colors we did the job ourselves so I am sure it took longer than… Read more

    • Jesse

      My initial feedback is that the stuff is excellent. A real money saver for me as the leaking roof on my 1985 Coachman was making the RV nearly unusable. It did thicken a bit faster than I thought, and it hasn’t rained on the roof yet, so my glowing review is only preliminary. So, at this point your product is batting a thousand. My motorhome is 23′ long and +/- 10′ wide, but one gallon nearly covered the entire roof, which was leaking like a head wound. I’ll take a… Read more

    • Rockford Michigan

      I put your primer and finish coat on and it is holding up like iron. my trailer roof was a 1974 18 feet long. pealing real bad. I cleaned it and primed it and finished coated it in one day . I am a retired painter best product for the money I have ever used thank you scott Scott Rockford Michigan

    • Stephen L

      Hi Kellie, I spoke with Craig about my new roof. He told me to send you these pictures to receive a gift card. My RV is a 1989 Georgie Boy Cruise Master. The roof was supposedly repaired when I bought it. However the repairman did not do a good job as the roof started lifting up while going down the interstate. After repairing the weak areas the leaks started. The entire front half of the ceiling was destroyed. Last summer I removed all the cabinets, and ceiling, then replaced it… Read more

    • Lou

      Thanks for the instructions. I did call the sales staff again for more info on some more questions I had, which I received polite and good answers making the decision to brush your product on B Deck the only option. While it is a task in doing so, even for a 300 square foot area the instruction covered all aspects of the applications including time and texture of product. lol I’m now waiting for full cure to continue to project and wanted to let you know it looks great and… Read more

  • Contact

    EPDM Coatings N.E Sales Office
    494 Bridgeport Ave Suite 101,
    PMB 342 Shelton CT 06484-4748
    Proud Distributor of Proguard Coatings
    Tel: 1-610-298-1989
Full Stocking Distributor of Proguard Coatings
Copyright © 2015 Buy Liquid Roof