Fursuit Washable/Safe Paint Suitable For Non-Porous Surfaces?

Trying to solve a puzzle and it's bugging the heck out of me.

I recently bought some really nice supplies for fursuit making, but the surface of my eye-mesh is non-porous and the paint isn't sticking to it. I've painted Chromacryl-Brand Acrylic and Createx Opaque onto the surface and it just scratches off.

Am experimenting with coating the eye mesh in black it before I use it on a fursuit head. Am I doing something wrong?
What does it take to make Createx paint bind to non-porous surfaces? Does it need a base primer or to be cured after application?

Thanks!