Per the instructions you should prep the area under the EB Tape with either the spray or can EB Primer. The primer is basically Acetone and you can get a quart of that at Home Depot or Lowes. It is TOXIC and will eat your hands if you use the can. The EB spray is really easy to use.
You can safely store it in the camper to use for emergency repairs and I recommend it. Also keep a small roll of EB tape in the camper, I have already permanently repaired a tree strike hole in the roof (camping trip would have been over before it started) in less than a minute with it.
EB tape can be lapped over EB tape for a long tear easily (must use the primer over the lower tape surface).
Eternabond EternaPrime Spray on Primer
buy your tape there too. Best price I found.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW