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If you intend to do more than one of these in your life, it’s worth investing in Lacquer-Stik fill crayons which are actually designed for this application. They are easier to use, the result is more durable and it doesn’t require a post-bake. For large filled areas, Hermes brand engravers enamel is ideal. Neither of these products is all that expensive. Cleanup time can be greatly reduced by lasering and applying the fill through a masking tape layer, then peeling it off with most of the excess.
Cool! I was thinking about doing something like this, but didn’t have much of an idea as to how to go about it. Stuff like is this one of the many reasons I love the adafruit blog.