When I do it I use GT85 on the square taper, tighten it up, then give it a couple swift knocks with a mallet to ensure it's properly seated, then usually turn the crank bolt a couple more times to tighten it up. A torque wrench is ideal, but not necessary
Thanks guys,
It's a square taper bottom bracket with a set of Middleburn rs1's.
I really hope not as I love the cranks!
@mdcc_tester
I'll try using different bolts and tighten them more.
Do people grease them or thread lock?