The level of precision achieved by the relume is actually quite amazing... Zig does these completely by hand, one little dot at a time. To put things into perspective, imagine doing the same- Tiny little applications of lume, repetitively, all over a relatively small and square surface area while trying to edge around numbers and borders and keeping the overall surface of the lume flat. And all before the lume dries...
Also keep in mind that there's practically zero margin for error- I doubt that lume is very forgiving and I'm sure that spares are not easily sourced for the inner bezel.