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.