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Had a 27' TT with EPDM roof for almost six years and only washed it once a year with dish washing soap. It was just when we traded it in last week for a '10 Montana. The sales guy asked me if I'd ever 'sealed' it - first time I'd ever heard that so I looked it up online. Dicor and other roof material manufacturers seem to think they don't need anything but what I did, and really don't even need that unless you've a lot of bird stuff that gets on it. EPDM is supposed to weather over time, but this won't hurt it. They are unanimous though in: "CAUTION: DO NOT use cleaners or conditioners containing
petroleum solvents, harsh abrasives or citric based cleaners. You may cause irreparable damage to your roof."
Laboratory tests conducted in July of 1996 evaluated the effect of a leading RV "roof treatment" product on EPDM roofing membrane using standard sunlamp and immersion testing procedures. The "roof treatment", which contained petroleum distillates, caused a 63% mass change (swelling). In the summary/recommendations portion of the lab test the scientists stated they would recommend the "roof treatment" and more tellingly noted, "Per the MSDS, this product
contains petroleum distillates, a substance that is known to be INCOMPATIBLE with... EPDM sheeting".
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