does locktite go bad?

As stated here, there are a wide array of "Loctite" products that all do different things (sealing verses locking) or do things differently (sealing and locking). While we are all familiar with "red" and "blue" Loctite, in realty there are a number of variations. My question is exactly what Loctite product are you using? I agree with the bad bolt and potentially worn threads comments.