Liquid Roof Applications

Instructions for the application of Liquid RV Roof®

Surface Preparation

liquid roof

Your surface needs to be clean and free of any; loose material, dirt, oils as well as any mold or mildew. Many of our customers as well as our RV dealers will use a Simple Green or mild detergent solution with a soft bristle brush to remove the surface dirt. It is very important that the surface is perfectly dry prior to the application. Once the material is applied it is 100% waterproofed so if you get an unexpected light rain there is no issue at this point. For those who have any rusted or pitted areas on their roof we suggest you wire brush them and clean off the loose oxidization before coating. There is no need to prime rusted areas if they are light to medium rusted areas. Heavily rusted areas will need to be coated with a rust inhibitor. Once the Liquid Roof is applied it stops the oxidization process. You should also perform a roof inspection since the roof needs to be structurally sound. Any issues such as dry rot or damage to the plywood underneath the rubber roof should be investigated and taken into consideration before considering a coating.

For those customers who have purchased a used RV, trailer or mobile home and do not know if their roof has been coated in the past we highly suggest you first prime the roof with the ProFlex primer found on our website. This primer will allow for an acceptable substrate for the Liquid Roof. If you are going over existing EPDM rubber, metal, PVC or TPO no primer is needed. If you have applied an elastomeric product or an asphalt coating then you would also need the ProFlex primer. Should you have any doubts please give our office a call our sales associates will be happy to assist you in answering your questions. Special note are Fleetwood units; most of them come standard with an “Alpha” roof system that also needs to be primed. Any loose caulk or existing silicone caulk should be removed and replaced with either an acrylic or butyl caulk.

Coverage per gallon

The coverage per gallon pail is approximately 42 square feet and 210 square feet for the 5 gallon pails. This will result in a 20 mil coating (the depth of approximately 5 pieces of paper). To calculate the total amount of material you need simply multiply the length X width and divide by 42. We do not suggest rounding down or “stretching” the material out. This will void your warranty. If you have questions about calculating the correct materials you can give our office a call.

Directions for mixing

liquid roof application directionBoth the gallon containers and the 5 gallon pails are “under filled” allowing you to add the catalyst and mix in the same container. This avoids you needing to emptying out the contents and transferring them to another can. You will need a drill mixer attachment. This cannot be mixed by hand. Both the gallon mixers and the 5 gallon mixers can be found on the bottom of the order form. For those ordering gallon containers the bottle of catalyst will be located within the shipping box; those ordering either the four or five gallon pails the premeasured bottle of catalyst will be under the top lid of the can. Open up the top lid take the bottle out and pull back the plastic seal to expose the Liquid Roof material. Begin mixing the material until a vortex is created by the drill and then slowly add the catalyst. Once the entire bottle of catalyst is added continue mixing for approximately 3-4 minutes in a circular motion as well as up and down until all the catalyst is equally distributed throughout the can. No catalyst should be visible at the top of the can once you’re done mixing. If you do seen catalyst continue mixing for another minute.

How to Apply

Majority of our customers feel the combination of a squeegee with a broom handle and a medium nap roller works best. Pour the material out in a serpentine manner “in the shape of a letter S”. If you were to try roll the material out just with a roller at this point you would just be pushing the roller. By drawing back the material towards you with the squeegee you level it out to the point where the roller has some grip and can turn. Continue that process until you are done with your entire roof. Some of our customers will spot check themselves to see that they are applying it at the proper mil rate. A good idea is to chalk off your roof into 42 square foot sections. When you are done applying in one of those marked off areas you should be done with one gallon of material. For vertical surfaces a paintbrush is fine. There is no need to worry about the material running down the sides of your roof. In fact, you would have to apply double the amount on a vertical surface (a 40 mil) before it would start running. Once the catalyst is mixed you have a four hour pot life which is more than enough time to apply the bucket of material. Any flashings or vents can also be coated with a brush. NOTE: We do not suggest removing the AC unit. For those wanting to apply the material thicker we suggest a thicker one coat vs. multiple single coats.

How the product cures

Liquid Roof will cure at temperatures above 55 degrees. The catalyst will evaporate based on temperature but is not affected by humidity or rain. What this means to our customer is as long as you apply the material on a dry surface the roof is already protected regardless of temperature drops, rain or even snow. The material will continue curing once the temperature gets above 55 again during the day. Normal cure time assuming temps are above 55 is 24 hours to the touch and 72 hours until you can walk on the coated surface. Should temperatures decrease during that time period simply add those hours to your overall cure duration.


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  • Testimonials

    • Hello,

      My name is Jeremy Berkheimer and I purchased the liquid roof coating earlier this spring. I am attaching the before and after photos of my 38 sandpiper roof. This coating was awesome. It took some real cleaning before hand and a I got a bit of extra exercise spreading it but the finished product seems well worth it. Thanks!

    • Hi

      Please find attached before and after photos for my camper roof. I forgot to snap a pic of the before, so I had already started applying the Proflex primer when I took the picture. You can still see the condition of the roof though! Also, the after pic was after the newly coated roof endured it’s first rainfall.

    • Paul

      Hi Everyone, I completed my project and it was much easier than I thought, I wish I had done this years ago, and glad I chose this coating versus the other offerings out there. I will send you 2 more emails, this is the start of cleaning, next is primer, the third is the coating. Hope they are worth of a gift card. Thanks

    • Fred D.

      EPDM is amazing. My RV roof was a disaster. I have been battling leaks for a few years now and no other product would stop the leaks or even last more than a few months. Everything else would peel up after awhile. I used the EPDM with the primer. It rained a week later. Zero leaks! The product goes on easy and covers well. No cracks no bubbles. I am very satisfied and would recommend this product to anyone. The are so many products out there and skepticism runs high…. Read more

    • David R. D

      Just a great product, went on easy and looks great. Just completed my 35 Bus, cut in the rap around sides and around the ACs and vents. Spent the hardest time on cleaning and prep. If you are looking for a product to seal your RV stop looking !!!! David R. DLincolnton GA

  • 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
Full Stocking Distributor of Proguard Coatings
Authorized Stocking Distributor of Proguard Coatings
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