ProFlex Primer

ProFlex Primer


BB-1501 White

Once the ProFlex is applied, the Liquid EPDM must be applied within 24-48 hours to ensure proper adhesion. The ProFlex needs to be a little tacky when applying the Liquid EPDM. If the ProFlex is tacky but does not pull up when you walk on it that is the ideal condition to apply the Liquid EPDM. If the ProFlex is allowed to dry the Liquid EPDM will not adhere properly. This will necessitate you waiting until the ProFlex has fully dried and recoat with the Proflex before re-applying the Liquid Rubber. The day which you apply the ProFlex primer needs to be above 50 degrees. Lower temperatures at night will slow the cure but will not affect the product. Do not apply ProFlex if you anticipate freezing temperatures BEFORE you are able to apply the Liquid EPDM Rubber. NOTE: The above procedure is not recommended for use in climate zones that experience temperatures below zero degrees F.


For our customers who are applying the primer over asphalt, please you should not have any visible separation of the layers. For any cracked areas around ridges they must be first cut out and filled in with the (ProFlex) primer and reinforced with our polyester fabric. For the Asphalt substrates there cannot be any separation between layers. Cracked ridges must be cut out and filled with PROFLEX and rubber mix and then reinforced with POLY FABRIC.
If you are using the Proflex Primer for an ASPHALT or TAR application it cannot be used areas of the country that are susceptible for prolonged “zero” degree temperatures. This does not mean wind-chill temps but actual ambient air temperatures.



After the primer is applied and depending on your temperatures in your state it may be possible to apply the liquid EPDM the same day; however, most of our customers will wait until the next day. What is important to remember about the primer is that you cannot let it dry. The primer actually still needs to be tacky when applying the top coat. A general rule of thumb is if you can walk over the primer and when you lift you shoes you hear your shoe lifting but you are not picking any of the material up on your shoes you are now ready to apply the Liquid EPDM. Now we are not suggesting walking around your roof and ruining your shoes. Simply pressing your hands into the primer slowly and lifting up will give you a good barometer to see how close you are. We suggest checking about eight hours after it has been applied to see how quickly it is setting up.

Its Usage

  • Existing Epoxies and even Urethanes coatings cannot be readily recoated without encountering intercoat adhesion problems. Proflex Primer® makes it possible to recoat them with the same or different type of coating.
  • Badly deteriorated wood and foams which have degraded surfaces
  • Proflex Primer® when applied to EPDM rubber membrane will prevent swelling caused by absorption of oils, fats and solvents around restaurant roof vents.
  • Thermoplastic membranes for example Hypalon

Properties and Appearance

Proflex is not meant to be used as the final coat as it will start to chalk normally after 2-3 months of continual exposure to the sun.

The film after the product cures is very flexible but also has significant tensile strength. It is for this reason that permits the product to reconstitute and ultimately stabilizes severely weathered and deteriorated surfaces.

Many people have asked us about the water and chemical resistance. The product has been tested and does in fact perform very well in these environments but it really is designed as a middle or “intermediate” coat to bond to existing surfaces or substrates which the Liquid EPDM cannot by itself.

Preparing the Surface

Substrate must be dry, and clean of any loose debris such as algea, dirt or living moss or oils. You want to be sure nothing is picked up in the nap of the roller during the application. Any loose chips or peeling must be removed. You should also either replace or make any necessary repairs to fasteners before applying the primer. If you have access to it many of our customers have used a power wash and let it dry.

Applying the Product

For flat surfaces the easiest method is a squeegee and a medium nap roller (1/4 inch short nap). In certain circumstances a pot sprayer can be used if the pot life limitations are not an issue for the installer.

Recommended Spreading Rate

The spread rate is 150 sq. ft. per gallon or (200 sq ft per gallon set). This will result in a 9-10 mil dry film assuming a flat surface. Rough or porous surfaces will require a lower coverage per gallon.

Product Data

  • Percent of volume solids is volume 86% by weight 89%
  • Gallon weight nine pounds
  • Spread rate at 1 mil 1379 square feet (this is NOT the required coverage but theoretical coverage)
  • Ratio equal parts of A and B
  • Viscosity at @ 77° F is 71-KU
  • Time to use product once mixed is 45 minutes at 70° F
  • Cure Time 10 hours to touch at 70° F
  • Strength is 250 psi

  • Testimonials

    • Dave H.

      Overall, I am impressed with the results I obtained in using Liquid RV roof on my trailer. It was MUCH easier than replacing the membrane with new, and seems to have repaired my leaking roof, extending the life of my RV, as at some point, the cost of reroofing would exceed the RV’s value. Thanks in advance!

    • Mike H.

      My roof was in bad shape. I cleaned it and kept after it a few times a year. We bought the RV used, and there were signs of neglect when we bought it. It had been obviously sitting in the sun for an extended period of time without any care or maintenance. I was about to buy a sheet of EPDM and forego the labor intensive and very expensive task of replacing the sheet roof. Then I saw a video on Youtube for Liquid EPDM. So the research began. “This… Read more

    • Tom Pituch

      I was able to quickly find the 2 pictures I took after I patched the roof. I will continue to look for the before pictures, We have a flat roof with a channel down the middle that leads into a drain pipe system that has been our weak point area all along. Then we installed a sky light which was like adding gasoline to a fire. For years I was blaming the sky light that we installed. We even replaced portions of the sky light and sealed around it many… Read more

    • Bob & Sally H.

      The two pictures are the before and then after using your product Liquid Rubber. Very pleased with the way it turned out! And also the shipping sure came quickly. Have a great and safe day! Bob & Sally H.Yuma AZ

    • Rick M.

      The epdm rubber roof was easy to work with. I am very pleased after having a leaky roof that will be good for many years to come. Roof had mold on it so we first killed the mold with Clorox and water and scrubbed I down and then cleaned the roof with Dawn dish detergent. Attached are the before and after pictures. ThanksRick M.

  • Contact

    EPDM Coatings N.E Sales Office
    494 Bridgeport Ave Suite 101,
    PMB 342 Shelton CT 06484-4748
    Call: 610-298-1989, Fax: 702-977-2936
    Proud Distributor of Proguard Coatings
    Tel: 1-610-298-1989
    Email: [email protected]
Full Stocking Distributor of RVRoofMagic
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