1. How long does it last?
2. If a vent etc. Needs to be replaced, can the tape be removed without destroying the rubber roof?
Answer: Yes you can but you must use heat (hair dryer) and razor blade.
3. Others experience with it after several years of use?
Answer: It is the best stuff to insure no water leakage. I have used it on my past 5th wheel as well as my present motorhome.
Get the 4" wide role x 50 ft from this place online.
It runs about $55 to $60 a 50 ft roll.
You can get white or black color.
Check Ebay. No tax and free shipping.