Well, here in the US, you can buy Colores Resins or Durenamel kits.
You could also use regular 2 part epoxy and mix in paint. I've done
this with spices, not paint. Worked fine for a small area. For
larger areas, you've got to worry about bubbles.
There's a book, I think it's called Resin Jewelry, good resource.
Anybody know what kind of paints to use or not use?
Metalsmith, Certified PMC Instructor
Hard to Find Tools for Metal Clay