I'm working on a game that requires several dice that aren't pipped. I've tried Sharpie on the 3/4" labels that you get with blank dice from teaching supply stores, but the markings get smudged after a few plays. I've also tried the big dice (I think the same kind as sold in the BGDF Catalong, even) and those get smudged as well.
What's the best way to mark dice so that the mark will be permanent and clear?
Each die will have various numbers on them, and different for each one.
And a protective coat of what?