@Ivan83 - Yeah I agree. I work in an auto shop and we use thread sealer all the time, but not just to work on cars. I've seen guys put it on fishing lures and pool equipment. We also of course, use it on all kinds of stuff when we are working on cars. It really is magical stuff.
I've seen a few jobs when people failed to use it and the results can really be disastrous. It really speeds up the wear and tear and there is almost no excuse for not using it. A good mechanic will have some at hand when they are doing any job.