This is a food safe plastic handmade mold. no mold release is needed. 2-Kawaii Mermaid shells Some Handmade Plastic Molds have what may appear to be watermarks. This happens in the vacuum forming process. If you glaze your finished pieces with Resin, the watermarks will not show. I try hard to make the molds with little to no watermarks, but, from time to time they can be unavoidable. Pieces made using this mold can NOT be used to remake into molds for resale.