I haven't done resins either, but if you are looking for something non-toxic, this might work. http://ooakartistemporium.com/Adhesives.html
Check out the Magic Glos UV Dimensional adhesive. From what I understand, it can be cured either with a UV light or even just in sunlight. This might be something you can try. Also, the DG3 is a dimensional gel that some people use when make a cabochon, but I'm thinking the Magic Glos would be harder once its cured. The lady who owns the store in the link above is awesome and her customer service is great! I've been shopping there for a few years now.
Like I said, I've never played with resin, mainly because I don't want to deal with fumes too, so I'd probably give this a try if I was wanting to make some. I have DG3, but I've never used it for something like this so Idk how it would do. It's great stuff tho.
Hope this helps!
Also, you might want to try Inkssentials Glossy Accents 3D Gloss Medium. My understanding is that it dries harder than DG3, plus the DG3 is in short supply right now. It's on the same page as the link I posted.