I make my soap in the flat boxes Dasani water comes in. I just slip them in a trash bag and fit and tape my corners and it works perfectly for me. After 24 hrs. I just unmold , pull the plastic bag off and I have a beautiful slab of soap. I do have a few molds I use but I prefer the boxes. A...
I don't know about adding oatmeal as a bottom layer but to add oatmeal to soap be sure to use the old fashioned oats( not the quick cooking kind). Put them dry in a blender and pulverize for a few seconds. Add at trace.