I recently ordered some Polymorph Plastic on eBay from this seller and have been really impressed with how it works. It’s a thermoplastic that comes in tiny pellets and when you place them in hot water they melt and are mouldable by hand – what’s great is that it’s reusable over and over again – simply drop it back in hot water and it melts again and can be reshaped. It can also be coloured using special powder you work into the plastic when it’s in the molten state.
Here’s some examples of what I’ve done with it:
