What paint is this on the charger pulley?

What is this stuff?

 

These are marks used by a mechanic or machinist to know when something has moved. They're called witness marks and can be found on some factory parts, a lot of remanufactured parts (for testing) and sometimes firearms.

 

Yeah, anyone know what kind?

 

Different people use different things from sharpies to paint pens to nail polish. There are some products made specifically for this but I don't know of any off the top of my head.

A friend of mine who is a mechanic/machinist at a factory says they will usually triple check that something is torqued properly, then use a scribe to mark the metal. This good because it's permanent but can also be a problem if something changes which can change the torque. So if a bushing starts to wear and results in the screw being in the same position but not the proper torque, you then have to re-torque and your scribe mark is off. It just depends on what you're marking.

 

It is called torque seal.

http://www.amazon.com/gp/aw/d/B005VR212M/ref=pd_aw_sim_263_3?ie=UTF8&refRID=0RXT7QTH1KSNASJK9GE2

It comes in a small tube in various colors. However, this stuff will apply with a raised profile. We use it quite a bit in aviation. Basically a quick visual to ensure a nut is not working free.

 

Thank you very much for this

 

awesome. thanks!