[Arran]

Not only does silicone thick and go on in gobs it has a nasty habit of coming loose and causing rattle or buzzing noises. I don't know where the whole idea of using silicone came from but I have had to scrape enough of it off of speaker cones over the years to know that it should stay around the bathtub and away from speakers. Rubber cement is iffy, if its reasonably fresh and smooth, like fresh contact cement, then it could work. Fabric glue works, the glue pen glue works, although it does get sticky again if wetted, I've been told that Thompsons water sealer also works though it is not cheap. I've never tried liquid tape but I have been using a type of black 3M rubber adhesive that seems to work well, and if it ends up too thick a quick wipe with lacquer thinner fixes it.
Regards
Arran