Try putting some thread lock on any bolts that take vibration, 
 i use the Tamiya one as a tube comes in each RC vehicle 
 you buy and you only use a tiny drop on each thread, 
 (can be bought seperate)  
 
http://www.ebay.co.uk/itm/Brand-New...sGames_RadioControlled_JN&hash=item2ebed9e242  
 holds well and allows bolts, screws etc to be removed when needed.  
 Just unscrew each grub screw add a little TL and screw back in, its oil and  
 water resistant.
 Don't worry about the disolves plastic bit, i have used it to glue/stick
 people/cargo in many dif vehicles/trains in the past and never found a plastic
 it disolves {so far} test first though just in case.
  
 The other option i have used in the past is Hylomar its a gasket/bolt sealent
 can be bought from a car spares  shop, comes in dif colours red, blue, black and
 gold if i remember right, you need  the blue i think as the others set hard, but
 check the blurb on the box for  the right one, Minimans probably knows which
 is the best one.