I love love love these pens. I use them on rocks. First I take matt white acrylic paint and prime the stones. Then use a pencil to draw on it. Then circle my drawing with these pencils. Then use acrylics to color in my drawing and finally go over my lines again to clean up the painting. The trick I found is that you can't even use these pens on slightly damp or even tacky paint, they clog and will never be the same again. But I recommend it to all my cave painting friends.
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