The glue has let go between the rubber and the roof. You'll need to inject a lapsealant or their rubber cement, a water based glue, to glue it back down. It's much like gluing a patch on a bike tire, then patching all holes with the patch kits. If it is a big bubble, you'll need to slit it open and apply the glue, then seal it up with Eternabond. DICOR is the main supplier of the rubber, they have install info posted. See the link below about our rerrof project. We got our supplies from tweetys.com.
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Bob Flight, Rochester, NY- '02 Travel Supreme
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