I went to Great Plains RV and got some self-leveling Lap Sealant. I believe it's made by Dicor. It seems to be good stuff. It should be dry by tonight. I think I'm going to spray the Flex Seal rubber over top of it just for insurance. The guy that sold it to me there said it's the same stuff their service techs use when repairing roofs. $10 a tube though. Also for $10 each I got two rolls of eternabond that are 2"x4'. Not sure what I can use them for. I'll probably just save them in case of emergency while out camping.