I was also wondering about the same thing. I knew it was craft paint but I was wondering if anybody has had success using it with gel. If so do you cover it with a layer of gel or just with the top coat.
I use acrylic craft paint and polish stripers on top of gel all the time. As long as you don't cover the entire nail so that the gel sealer and top coat have gel to adhere to on all sides--it works fine. I really like OPI Axxium Clear Gel Overlay for sealing in handpainted art.