RV Roof Coating Application Instructions | RV, Trailer, Motorhome and Camper Roof Repair


How to determine how much Superior RV Liquid Rubber Roofing you will need:

  1. Measure the length of your roof and the width of your roof.
  2. Multiply these two numbers together to find out the surface area of your roof.
  3. Divide this number by 42.
  4. This number is an estimate of how many gallons of Superior RV Liquid Rubber Roofing you will need.

Caution: Apply this product in a well ventilated area. Extinguish all sources of ignition. Uncured product is a flammable liquid. Keep product at room temperature for ease of application.

EPDM or TPO? How can I tell which one is on my RV roof?

There are two types of rubber membranes that have been used extensively on recreational vehicles over the years. Typically, they are both white on the surface, although some epdm roofs may be black or tan.

TPO (thermoplastic polyolefin) is a harder, less flexible rubber and usually solid white in color all the way through. EPDM (Ethylene-Propylene-Diene-Monomer) Is more flexible and has a black underside.

TPO can be coated directly with solvent borne coatings, whereas EPDM has a tendency to bubble and distort if it comes in direct contact with solvent-borne products and must be coated with a special flexible primer first. This is especially true in the case of Alpha® EPDM roof membranes made by Alpha Systems LLC. Alpha EPDM roofs were used on many Fleetwood products including Bounder motorhomes prior to 2012. Jayco and a few other manufacturers used this same membrane for years, with some manufacturers alternating between TPO and EPDM at various times. This can make identification difficult at first glance. To properly identify which one you have, go inside your RV and unscrew the trim molding piece (garnishing) under a roof vent (skylight). This should expose the roof membrane where it was folded and stapled inside the roof structure prior to installing the vent. If the underside is black, it is EPDM. If it is white, it is TPO. 

Preparation for all surfaces except plywood:

Using laundry detergent and warm water, scrub or power-wash roof and remove as much surface dirt as possible. Remove all silicone (nothing adheres to silicone), loose caulking and poorly adhering coatings. Flush with clean water and allow to dry completely. 

Preparation for fiberglass:

If surfaces are still shiny, sand with 100 grit sand paper until gloss is removed. Wipe off dust thoroughly.

Application for  EPDM and TPO rubber roof membrane:

Using a brush, apply a light coat of Superior RV to fill all seams, depressions and around all objects protruding through roof (vents, skylights, pipes, etc.), and any areas that cannot be accessed with roller. If your roof membrane has rounded or bullnosed edges, apply a light coat using a brush to the vertical portion and the rounded edge of the bullnose, all around your roof edge. Allow to dry three hours. Apply ONE THIN COAT to entire roof surface using a short nap roller and allow to dry 48 hours. CAUTION: DO NOT APPLY A HEAVY FIRST COAT ON EPDM OR THE RUBBER MAY DISTORT AND WRINKLE. DO NOT APPLY MORE THAN 1 GALLON PER 100 SQ FT ON THE FIRST COAT. (Example: An EPDM roof that is 25 feet long and 8 feet wide is approx. 200 sq ft., so you would not apply more than 2 gallons on the first coat). After at least 48 hours, apply finish coat using long nap roller. If you are unable to complete the second coat because of  inclement weather or time constraints, it is not a problem.  A second coat can be applied at any time within the next week, provided that the roof remains clean and is free of  moisture.

Application for fibreglass, vinyl, plywood, & aluminum (do not use this method for EPDM):

Using a brush, apply a coat of Superior RV to all seams, depressions and around all objects protruding through roof (vents, skylights, pipes, etc.), and any areas that cannot be accessed with roller. Allow to dry at least 3 hours. Pour Superior RV directly onto the roof surface and spread out with a long nap roller. Remember that Superior RV is a coating, not a paint, so it must be applied liberally in order to form a protective membrane. Wait at least 24 hours before applying a second coat. Note: If you are unable to complete the second coat because of time constraints or inclement weather, it is not a problem. The second coat can be applied at any time within the next week, provided that the roof remains clean.

Other information:

  • The shelf life of Superior RV Liquid Rubber Roofing is 3 years in a well sealed container
  • Product can be applied as low as 35F (Please note that the colder the temperature, the longer it will take to cure)
  • Frost will not damage coating that is already applied
  • Superior RV Liquid Rubber Roofing can be applied in temperatures as high as 95F

Precautions: Do not apply this coating directly to Alpha Brand EPDM roof membranes or pre-existing coatings without applying Superior Flexible Epoxy Primer first. If you are not sure if your roof is an Alpha Brand EPDM roof, use the primer anyway, as it works well on all epdm roofs and you will avoid bubbles, swelling and/or distortion on the rubber. The Primer as well as Kits that include primer can be found here.