Originally Posted by TCNashville
I've actually thought about using multiple rolls of 6''x50' Eternabond tape overlapped 1/4'' to cover my entire roof. I think I costed it out around $800.
You will need far more than a 1/4" overlap. Also, that could be a lot of weight added to the RV for minimal gain. You can get similar adhesive membranes that come on far wider rolls from commercial roofing suppliers.
Frankly, I feel you would be wasting your time and money on a scheme like that. If your roof membrane is in decent shape, just use regular Eternabond on the seams and edges. If the roof could use a coating, use Eternabond's WebSeal on the edges, seams, and to cover any damage, then use a roll and brush on coating designed for your roof type (you can't use a coating over regular Eternabond--it won't stick well--hence the need for WebSeal).