Just got a new Shimano UN300 bottom bracket and wondering what to do about this hard dry blue stuff filling about half the thread depth of the non-drive ring. Probably threadlock, but it's thick and hard and looks like it's going to make threading the ring into place more difficult than it would otherwise be. And it's not even on the full depth of thread. Shimano's installation literature makes no mention of this blue gunk and says to grease the threads. So why put it on at all? To at least have
something on one side of the bb if it gets installed dry straight out of the box? It seems like half of a half measure and not helpful at all to the careful mechanic.
I'm used to greasing both the bb threads and the cup threads. In this case, with aluminum threading into steel frame, considering anti-seize or fresh liquid threadlock. It makes no sense to put grease or anti-seize over dry threadlock, so should I just clean this stuff off, assuming limolene, paint thinner or acetone will have adequate bite.
