I may be wrong but I think eternabond is your best best. One thing that I think is a very important step is to make darn sure you clean the area very well before applying the patch. I believe there are many cleaners but I purchased the eternaclean and it worked very well for me. I bought both from amazon.
I assume you found the source of the leak. If not, water is a fickle booger, it can come from many feet away from where you spot the dripping water. Good luck with the repair.
2014 Tiffin Allegro Bus 45LP
Full Timers for now
Home State is Kentucky