Scotchbond Universal (and several other excellent self-etching / silanating / desensitizing bonding resins) are wonderful tools in adhesive dentistry.
The problem with a superior self-etcher is that it can get on teeth that I have no desire to bond to.
Plumber's tape is an excellent way to cover the adjacent teeth without getting in the way and keep the BOND where I want it. Get it at any home improvement store.