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Some said that some rubber roofs are an alpha type.  After removing a vent I found that the material on the roof was white on the top side and black on the underneath.  And supposedly that is not an Alpha type and therefore compatible with RVRoofmagic.  But I wanted to ask to be sure.  thanks
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No primer is needed . We do recommend a flash coat then a final coat.

 

please see below

If you have an existing epdm roof, it is important for you apply a very light coat (a flash coat, approximately 4 mil or the thickness of 2 pieces of paper). Failure to do so will result in swelling of the membrane which will require additional days for the product to settle. The final coat will be at a 16 mil thickness. Divide the length of your rv by the number of remaining gallons, this number will tell you the length of the sections needed for each gallon. For example, if your trailer is 24 feet long, you will need 4 gallons. One gallon will be for your flash coat. The remaining three gallons will be for the final coat. After your flash coat, divide your 24 ft long trailer by 3 (the number of remaining gallons) resulting in eight-foot-long sections. Each of your remaining gallons will cover one of these 8 ft section.

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