PoYo Putty 40 is a two-component mold making silicones (tin catalyst) that can be mixed and applied “on site” – directly to almost any model. PoYo Putty will hold any vertical surface and capture even the finest detail and is perfect for making strong rubber molds that can be used within minutes. Use Less – Do More: Because PoYo is applied as a thin layer, less material is used, saving you money. PoYo Putty molds are also lightweight, making them easier to handle.