I realized I had some urethene pigment on hand, so I thought I would give the belt mold another try. This time I'm using a different brand of urethene along with the pigment.
Based on how the stuff mixed, I'm much more optimistic about this pour than the last. The color is decent, though not quite right. But most of all, it's really opaque, and that's what I'm after.
I'll check back in tomorrow to see how it turns out.
By the way, that's the cape mold in the top of the picture. It's not done yet, but almost there.