What do you use to mark torqued bolt head?

[mlt]

I just wonder what I'm supposed to use to mark bolt head and counterpart surface to see if it moved later

I thought I use something like paint marker. I picked up one in Napa. However nib is so thick and paint is so thin. I was unable to mark continuous line. After pushing the nib a couple of times, instead of making a good nice blob at one spot, it spread around under bolt head rendering it effectively impossible to say where the mark is

Before that I was thinking about some touch-up paint as I have spare primer sitting around, but priming the bolt was not my goal either.

Don't tell me that you are using a nail polish for that

[jason m]

make a scratch mark with a sharp awl or chisel

[mlt]

Originally Posted by jason m

make a scratch mark with a sharp awl or chisel

I'm afraid it is too much and too permanent. I remember before I've undone bolt, it had nice big and thick blob from the factory that completely came off when I used a wrench.