I've been playing with some painted wonder under, really it's been a struggle, and it won't iron to the fabric. I'm thinking it may be past it's prime and if I had my camera cable I'd download the images now! I was able to get a small portion to stick to my cotton fabric, but the foil wouldn't stick the Wonder Under, I even tried unpainted WU and no dice.
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Metallic paints on Wonder Under layered over angelina and thread couched felt.