(You can set the soap on the top edge of the mold where the shark is to help keep the shark soap in place.) (soapdelinews.com)
Do you just butt the lower edge of the molding against the top of the vertical planks and, what, caulk the seam? (theletteredcottage.net)
Once you've achieved your desired look, carefully place one shark soap into each of the four cavities of your mold so that the shark toys are positioned at the top edge of the mold and the red soap bottom is positioned toward the middle of each cavity. (soapdelinews.com)