It WORKS! I'm so excited!
The black faded a little, but that was expected because the Colorant was in a shaving cream carrier. The shaving cream has to come out, but I actually like it with a little more subtlety in the black.
The Tackifier layer with the mica powder looks great. I turned the T-shirt inside out and washed it in cold water. It held beautifully.
I need to repeat the washings to see how long the Tackifier continues to hold the metallic powder...
More tomorrow! :-)