3. POUR SILICONEClone A Willy’s incredibly pure, life-like silicone is what makes us so special! Some ‘silicones’ are hybrids or tin-cure silicones, and aren’t necessarily body safe. They tend to shrink and break down over time, and often smell funny. Your finished clone is a medical-grade platinum silicone, free from contaminants, phthalates, or toxins of any kind. It‘ll not only be absolutely true to size and shape, but it’ll be completely safe to use. , The first step of the cloning process is to create a precise negative mold of your willy. To achieve the highest level of detail, each Clone A Willy Kit contains a specially formulated body casting alginate. Alginate is a natural polymer derived from brown seaweed. It’s completely edible, body-safe, and lots of fun to use! 2. INSERT WILLY, Body casting can be done at home using a papier-mâché technique, although unless you have the materials already at home it’s usually more economical to buy a kit. The Deluxe Adult Body Casting.