Hey, thanks for the comments guys! Glad it helps out in any way, shape or form!
While the concept of tinting resins and epoxies is an old one, the tints sold specifically for them are usually pretty expensive. I've worked with a lot of different stone in my field/art and started using alternatives for "FILLS" when I ran out of a certain tints.
I've used many brands of aqueous or "water based" paints and never had any problems with them affecting the base chemicals. You do want to stay away from solvent-based paints as they will, usually in the form of not completely curing or NEVER curing . . . lol The clear hobby paints work great!
Also, when I've needed a part cast in resin for small details, I'll throw in a little bit of the matching color that was used to paint the main piece the cast parts will attach to and voila!!! No painting required!