I’ve made a couple of engraved bands for my daughter but the infill does not last long. She is extremely active, an army combat medic and does (and wins) tough-mudder style competitions for fun…
I’ve used latex and acrylic, neither hold up. The bands are black so I’m using white or silver as a backing. The best results were latex but it does not bond to the silicone, i.e. it peels out after exposure to moisture and such.