I'm going to have to see if I can find some pringles at the store just for the cans. I haven't wanted to try pvc but everyone seems to have good success with pringles cans if they're lined. I like the heavy plastic liner idea.
I used OO, CO, shea butter, RBO and castor oil, Donna ..... and added about a tablespoon of kaolin ppo (mixed in a little water to make a fairly runny paste) to the white soap.