Hi La Donna,
It sounds like you are using UV resin? If so, I think you will like two part resins better. Here are what I think the advantages are:
1. Longer shelf life. If you have properly stored your two part resin, it should remain usable for a year.
2. Less expensive. You will get a lot more two part epoxy resin for the same money you would spend on a UV resin.
3. No equipment. Once you mix a resin and hardener component, they will start to cure. You don’t need a UV lamp or need to worry about putting your pieces in UV light.
4. Versatility. Two part resins are great for casting in molds. UV resins are only designed for use in bezels and other shallow pours.
5. Less shrinkage. Sometimes UV resins can cure with a lot of shrink. Two part resins do better with this.
Does this help?