I read about those panels a while back. The manufacturer said that they did not currently have the technology to make those lines go away. I have two of the panels to try myself. They would make a good pet blanket, or maybe put a pretty fabric on the back for a picnic quilt. They would also make a good play quilt for kids to use in the yard or floor. I'm sorry you were told they would disappear, but at least you learned from using them.