However, I have also used crayons, rub them over the stampings till they fill in. Use an alcohol swab to remove any that gets anywhere you do not want it. I have used this method to make stampings and serial numbers easier to read for years. Have a couple rifles that were done about 10 years back that still look good.
Same here. I use crayons. The paint kinda makes a mess. Ive painted in roll marks. Then cleaned up the area with nail polish remover. Crayons are just way easier to use. Plus it seems the colors are brighter(reds and white). Parkerizing really sucks paint up and really makes it hard to clean up to where the letters are sharp.