[flyonthewall]

There are glues available to the modeler made specifically for this purpose. I forget names of all of them, one being called 'Tacky Wax', I purchased another one some time ago which works quite well, forget what its called but will find out. This particular one is applied to the part and left to dry, then attached. It can be pulled apart then reapplied but the residue is tricky to remove when you're finished. Prior to using this glue I used PVA (wood glue) or Krystal clear as others have used above. Krystal clear provides a good bond but can also be tricky to remove residue.