I recently received a welding helmet as a gift and I decided to make sure people would know it was mine by painting it with Posca paint markers.
I have a membership to Sector67 in Madison, which as Welding tools.
Thus far I have not done any type of clear coating over it. If you scrape the paint with your finger nail you can remove it, so a shellac might be required for long term preservation. I am going to try it out as-is and see how it wears.