Originally Posted by Spud99
I get old nail polishes in different colours to use to mark bolt heads that have been torqued on reassembly. With different colours I know if it is newly retorqued by looking. I never forget to tighten important stuff like brake parts etc.
You can get torque paint from an aircraft supply. It's a thick yellow lacquer that's painted on fasteners when they're torqued, and it will crack if the fastener is moved or loosens from vibration.