Been there, done that. Well, not exactly but it was a plastic bag to close to my iron. What a mess! I did a very intricate Valentine heart paper pieced block. I got it all done and realized a small but critical piece was the wrong colour. Don't call the Quilt Police but I cut out the piece with wonder under on it and ironed it over the spot. I quilted the edge done later and told myself it was now raw edge applique. Nothing is as accurate as PP but when it's wrong, it's very wrong!