Using epoxy resin rather than grout

I have been doing mosaic projects for years using tile, glass and garbage. They’ve all been on walls so I have grouted (not prettily) and then verathaned to seal as they have all been outdoors. The problem is that over the years the weather and sun cause the grout to crumble and the verathane to yellow so constant upkeep is required. Last year I did a sidewalk and could see that it wasn’t going to work with that process. So I put down dry cement three to four inches deep, placed the objects in the dry cement and watered the cement until it was soaked in and dried hard. I then took epoxy resin and poured it over the entire 31 foot stretch of sidewalk. It’s beautiful shiny and hard enough to walk on and wash it. I so love it, I would like to try it on a wall. I did a smaller section vertically and the drips were pretty crazy. Are their thickeners to make a more jellied consistency? Or do I just deal with drips? This is a crazy question, but if you go to pastichegardens.com you can see my challenge.