Blue Loctite 243 remains my medium strength thread lock of choice. If you’re re-assembling fastenings that may need to be dis-assembled at some point in the future, Loctite 243 is a no brainer for availability, price and performance. Note too that 243 is a better product than the almost obsolete 242 being tested by Project Farm. Better because it has a stronger bond, better because it is oil resistant, better because you don’t have to meticulously clean every thread, a quick spray of brake cleaner and your good to go, fully cures after 24 hours.