Teton project seal

[jonbrown]

A few may have read a few of my latest posts on my 92 Teton rebuild project.
I am now at the stage to put the new Filon on the outside 21' of the trailer.
But it is a mystery to me and the basic question I have here..
How do campers really seal the corners where the caps meet? All four of my corners leaked and that is the reason for the rebuild.
I see no way that in 5 years a camper can be leak proof . It is really a piece of trim molding with a rubberized back 1" wide putting the 2 pieces together..
I have studied this and wonder how am I going to make this more permanent?
Out of a simple argument on this me and a friend removed the trim from his 4 year old fifth wheel and sure enough it had either sweated or leaked and behind the filon was rotting. So is this just the way it is going to be?
Thanks, Jon

[glennwest]

That's why we check caulking every 6 months. Lack of maintenance is why units rot.

[Quest]

how about some eternabond tape before you you pace the trims and molding on ?
this will create only a few places of potential leaks and that will be whee the screws will go instead of the whole joint.
If you do a clean cut of the roll you can get it all concealed under the trim and nobody will will be able to see it.
It will be like a "drip edge" that will be weatherproof and under the trims.
Just asking...