This is a method I learned from ar15.com
Clean the area with soap or rubbibg alcohol make sure it free from oil and dust particles.
Then just rub and push the cryons tips in to it.
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with finger tip pressure, use rag damped with WD-40 to wipe off the excess.
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That's all to it.
I have use the same on my other black guns for over a few years now.
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How "permanent" is the crayon?
Tacticolor
this is what i thought.....off to wally world for a red and black crayon.