No pictures handy but my
cast iron skillet is at least 50-60 years old and when clean and properly maintained has a glassy smooth finish. The best thing I ever did for this
skillet was to start cooking bacon! Cooking bacon in it daily built up a nice carbonized layer of oils and as long as I keep doing that virtually nothing sticks to the surface.
When I acquired the skillet, it was rusty and useless. I scrubbed it to shiny metal and then treated it with cooking oil in a 500 degree
oven to start rebuilding the carbonized/polymerized oil surface. It worked OK and slowly got better with use but when I started having bacon and eggs for breakfast it suddenly developed the surface I was always looking for!