My big disappointment with Lumiere came when I watered down some copper-colored Lumiere paint, and the brown pigment separated out on the fabric from the metallic, so the metallic was no longer coppery at all, and the brown was just blah. (I washed it out
immediately and got most of the brown out of the fabric.)
It would work better, in the concept I was reaching for, to use copper-colored Pearl Ex, since the color in that case is attached to the mica particles, and mix it with some fabric paint binder like Neopaque
Colorless Extender to hold it to the fabric, but I've never gotten around to doing this. The Colorless Extender is not going to feel any softer on the fabric than Lumiere paint.
You're only supposed to add up to 25% water; in my disappointing project, I am sure I used a lot more than that.
Paula