Did it today - Tumbleweed on the M&P logo, red/white on Fire/Safety. Had to heat up the polymer with a hairdryer a bit, then melt the tip of the crayon to get a nice smooth coverage. Just smear it in and wipe it away. I did the "Made in USA" in red/white/blue thinking it would be nice, but you can't see the blue. Considering chipping it out and doing a brighter shade.