Bonzo's progress

[acra]

That's a great idea Bonzo, we use the same thing in the Aerospace world. The name escapes me, but it's something like proof paint or something similar, and we put a line of it across the nut, surface and bolt, to prove that not only has the fastening been tightened (to torque usually), but also that it has not moved in use (by vibrations etc).

Definitely a good thing for piece of mind!