Are all M&Ps glycerine based? I mean I noticed they all contained glycerine, but are they all glycerine based or some just have it added to make it easier to pour?
Also any additives that can make a soap harder?
Well, I might go for M&P if its not glycerine based and stays hard after it cools down. Have you had any experience with non-glycerine M&P from there? Also which ones on wholesale Supplies Plus are non-glycerine based M&P?