Unless the assembly will be subject to excessive vibration, you can skip the glue. It's mainly intended to reduce shipping damage and may provide stability during the build process. I'm leary when the stuff turns brown because it is often conductive at that point -- conductive enough to cause problems of its own. I've seen lots of older units, particularly Keocera, come in with "noise" complaints or in protection. First I scrape off that glue, even before I turn them ON. If nothing is obviously burned, they are usually OK at that point.