While many soap makers use silicone or wooden molds for their soaps, there are plastic molds that can be used to shape cold process soap as well. However, the unmolding process is different for plastic than its wooden or silicone counterparts. What’s the trick?
When using a plastic mold for cold process soap, be sure that no air is touching the soap inside. This prevents imperfect shapes. Also, soap in a plastic mold takes longer to harden, taking up to 2 weeks before it is hard enough to maintain its shape and design. Keeping this in mind can help you create some great soap molded into a fun pattern. For a more detailed tutorial and tips, click here:: Unmolding Cold Process Soap from Plastic Molds