Here is one last technique to get text or lettering into resin.
You can rubber stamp images or words if you use a permanent ink.
I have a tiny "for you" clear stamp. I attached it to the bottom of a marker and practiced stamping it on paper before I stamped it onto the resin surface in my prepared bottle cap. Resin, like glass is a super slippery surface! This takes a very steady hand. If you have good hand writing you might prefer to just write the words.
I also use glitter gel markers. They are a great way to add words or highlight text in a resin bauble.
Once the ink is completely dry you can pour resin over it and it will appear to float.