Fasteners subject to heat and vibration often work themselves loose. Often, the quick solution is to use lockwashers or thread-lock compounds. A more-permanent, less-costly solution from Balax Inc., ...

According to Loctite’s manufacturer, Henkel, Loctite (loctiteproducts.com) does go bad. The technical data sheets of both thread-locker 271 (red) and 242 (blue) say that the shelf life of each is 24 ...