Color fill the engravings...??

[Raul Duke]

White-out works well too.

[Adawg38]

I just used model paint from Hobby Town and their paint thinner. Grab the thinnest brushes they got and any overage use a cloth with a dab of thinner to cleanup. After it's dry daba little bit of gun oil over the area and you're good.

[Punkface]

I used crayons

[bear71]

White crayon works best and stays on! After coloring, scrape excess off with a credit card then finish by rubbing with a soft cloth.

[JoeT]

I use the kid's poster paint...and mineral spirits