Ok I thought about it a little more. Its either two things. I remember there was powdered pigment. It’s either that powder coat stuff that you heat up to cure then the added a uv cured top coat. Or it’s that uv cured stuff for women’s nails where they put a cured clear on their nail, dust on pigment, use the uv light, then put another clear uv cured coat on top. I think it’s the 2nd. He might have gotten the idea from when his wife did her nails. Either way, it’s uv cured clear over some sort of color.