Class C overhead Cabin Leak

I highly recommend using Eternabond tape around all roof vents, the roof sides, over the front and back caps, and covering the cabover trim that curves over the front from the roof to the back of the cab. Then forget about caulking roof seams and sealing the trim for 30 years. If you work slowly and carefully and use smaller widths of the tape where needed it looks good. I used three 1" strips overlapping to cover the cabover trim. After this picture was taken I painted the gray sticky adhesive sides of the tape and it now looks not like factory, but like white trim that came from the factory. I cut the tape down to 1/4" and sealed around front window and the clearance lights.