Using the lube in the BlackJack kit I've had no subsequent leaks either. I suspect either will work, the glue option is "belts and braces", but has a shorter shelf-life, the volatile solvent(s) bleed off, and it dries up.
Commercial ones are more robust, and have the tighter fit to not need replacing regularly. Might also save a tiny bit of electricity. Harder to get the plug in, but you won't have to worry about a loose contact.