Soapy Mess-Up Quick Guide - Soap Queen
Soft Soap For most recipes, soap needs to stay in the mold for 2-3 days. If after 7-14 days the soap is still soft, it is unlikely to harden. Soft, squishy soap can be caused by several factors. One reason may be that not enough lye was used in the recipe. If the soap does not contain enough lye, the oils will not saponify.