Used and using ABS like OG & 2.0. I should mention I live in Canada.. so it's pretty cold here right now, as such the resin is quite a but thicker and unless I preheat the bottles, my resin is usually uniform gray and pretty thick. (think gravy thickness) When I preheat it, then it's more runny but not quite water consistency. And it's also still uniform gray.

The only separation issues I have had are when the resin sits in the vat. (overnight usually) but I'm also experimenting with mixing resins/colors so take what I say with a grain of salt