What kind of adhesive does Apple use?

The bottom case of my TiBook is a little loose at the battery corner. When I type and rest my palms on the top case, it kind of "pops" or "clicks" a bit as the pressure moves the top and bottom cases together. It's not a big deal, but it's annoying enough to want to fix. I tried to get the folks at my local Apple repair center to deal with it under Applecare (I have about a month left.) They said it wasn't a warrantied problem, but they did offer to glue it for free. I didn't think that was a good idea, so I declined. I have since been told that Apple glued the bottom cases of the TiBook to the frame at the factory, so that would have been the appropriate repair.

If that's true, what kind of adhesive did Apple use for that, and exactly where was the glue applied? It must have been a prettty strong glue, and sparsely applied, as I didn't see any traces of it when I took the bottom off the computer. In any event, if gluing is the right move, I'd just as soon do it myself. The repair center would take at least a week, since they're usually so backed up. But I don't want to use anything that might damage the case or leak into anything.

Thanks in advance for your help.