Rubber Roof

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You haven't given us much to go on.  Year/make/model of RV might give us a clue.

TPO is usually recognizable because the surface is shiner and somewhat different texture.  It typically does not chalk. Alpha Systems calls their TPO and Alpha-Ply membrane "hair cell" and describes it as "orange peel".
 
Compliments Mr.Gary, I have read many of your answers to RV'ers questions, thank you. You are correct mine is orange peel in appearance, I called Forest River,  by the way my RV is a 2007 Flagstaff, it has a TPO roof. I am a newbie to RV's. I thought after watching YouTube video on discerning your rv roof type that i had a EPDM ,it isn't black but it it is not white either on the backside of the membrane, it's a gray fleece, so much for my assumption, its a TPO made by Alpha Systems. I have a dilemma, I recently purchased Dicor Acrylic Coating two step treatment for my "Supposed " EPDM roof, that is TPO. I called Dicor they said it will work on TPO roofs, I also called Alpha Systems and they told me they have not done any testing with Dicor is Acrylic Coating, that I should call Dicor. Alpha did say that there roofs did not need sealing just washed periodically. Alpha also said sealants did not stick well to TPO roofs. I was hoping to seal my roof after repairs, to hopefully add some life to the rubber roof, also cosmetic. So more research before I make a final decision. Has anyone on this Forum put Dicor Acrylic Roof Coating on their TPO roof?
 
Maybe this is what you want:

http://www.campingworld.com/shopping/item/super-flex-total-protection-self-leveling-sealant-11-oz-tube-white/80294

 
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