I still line mine, just makes life simpler. I even make hard soap recipes with lots of palm and or lard and they still stick to my hdpe. Of course I unmold early because I cannot afford the time for the soaps to sit in the molds. Cutting the side off with wire just did not work for me either with my 18" molds, if was harder than lining and trying to twist an slide off the sides would only result in chunks missing from my soap. Probably did not leave them in the mold long enough