The method I've been using is getting a rubber stamp made of your text - leave a blank where the text will end up being, allow materials to fully harden (I do everything with ApoxySculpt or Sculpey, so this may not help you at all depending on materials), carve out a little depression, fill with fresh apoxy, and after it firms up a bit, press in the stamp. After that bit hardens, you can go back and sand the surface smooth, leaving your text.
What I like about this method is you can get good-looking, correctly spaced text on curved surfaces (like gun barrels, circular statuary base, etc). Most custom rubber stamps come just in a little sheet of rubber, without the wood block. You can trim it down and mount it to a matching curve as your intended surface, to help with applying a more even pressure.
Hope this helps.