I am trying to smooth the rims of cut wine bottles. There are several companies that do this now but will not share their secrets. I want a rim that is fire polished not sanded. I tried to do it in a kiln without success. (the bottles accordioned down with the edges staying the same) Then I tried to use a torch and they shattered. I tried to heat them in a kiln and torch while they were hot and they shattered.
Any and ALL suggestions will be greatly appreciated