Screwlock or Nutlock are the weakest. Then you get Studlock & Retaining Compound etc. which are more difficult to break. Hang on, I'll go and have a look at the Loctite website...

Right, I'm back. Well those I mentioned are the old names. The weakest is Threadlocker 222. Then Threadlocker 262 & 243. Strongest threadlocking stuff they do is Threadlocker 272 & 2701. I'd go for the 222, that'l be enough to stop the buggers coming undone. Personally I don't think it is the rubber mounts, but you won't know until you take it apart.