leaking problems

[Brady-SKO]

I have a ford e450 2008 with a fiberglass roof. Before I got the bus the previous owners said there was a leak but they thought they fixed it with caulk. a few months after i got it i realized that in the back on the left side it was leaking. along with out of the back right corner of the emergency exit. i used some eternabond tape on all the seams. This seamed to work for months but today i realized it is leaking in the same spot in the back. If anyone has any suggestions on how I could go about finding the leak. Or what materials I should use to seal it. Any information would be appreciated.

 

[kromboy]

I thought lap sealant was basically the tried and true roof sealant for leak proofing. Then reapply every 2 years or so.

Although, Eternabond shouldn't deteriorate that fast, it could be in the application, i.e. prep work.