Originally Posted by dirty_sanchez
243 is an oil tolerant blue medium strength threadlocker which doesn't require you to shake it up like the older technology 242 blue threadlocker.
Hi. I've wondered about this. Why do they not just junk the 242 and only make 243? Seems the commercial product (Permatex) is often 242, but why, when 243 is easier to use because it is more tolerant of oily parts? Last question :-) Is 243 simply a newer, all-around better product than 242?