Well jelaw,,ik this sounds kinda weird,,but i used a standard WHITE CRAYON from my grandsons coloring crayons,,its clean,,easy to redo if needed and it is not permanent. I run it across all the engraving in a circular motion to fill it all in then use my thumbnail to remove the access,,try it you will be surprised how nice it looks,,and if you want to remove it a standard sewing needle does the trick. Let me know what you think.