Best Answer:I have only used my pan a couple of times and did add some brushed on butter before putting the batter in the pan but more for flavoring than need. The pans are very slick and non-stick. I would argue the popovers would pop out without any assistance. But the butter is a nice flavor addition and might help crisp the popovers if hot when the batter is added.
Best Answer:The finish. Like any nonstick finish on a pan or pot. I don't know the technology if that is what you are asking. It's well applied--and they definitely don't stick. I've used them a couple of times and the popovers come out great. Let me know if you have more questions. Thanks.