I covered my ponies head in Saran Wrap then sculpted the mask on and let it dry. When I removed it, it was too loose to stay on on its own. I had intended to glue some ribbon to it or magnets to hold it on. Instead, I added more clay to the back of the mask when adding feathers to it, then pressed it back onto the face with no Saran Wrap and let it dry. It dried with a snug enough fit to the face that it needed no ties.