You can use the clay to do all sorts of magic to plastic parts. It’s also reusable. Lastly, some lead weights or shot bags and a ton of rubber bands; these are used to hold your molds together.

Since the parts might get hot, the plastic is PETG. The trick is that parts need to be conductive in order to use electroplating — typically plastic isn’t conductive. [Clem] paints the plastic ...