I’d been wanting to try using a fondant mat to make an imprinted soap for a while. I bought the mat to do so about six months ago. I only just recently used the mat to make soap. It’s really quite easy to make. I bought the mat. There are many places you can find them online. I got mine through Wilton.
I then cut the mat up into two pieces to fit my mold. I did a piece for the bottom and one for the top. You could probably make pieces for the sides too if you wanted too. I made my soap, poured it in. And then after 24 hours just peeled the mat off and cut my bars.
Very simple to do, and gives you a pretty soap.