Frustrated by the limited access to plastic blow-moulding equipment, George Fereday went ahead and developed his own, outfitting a standard 'mastic gun' with a specially designed extrusion nozzle and air-compressor fitting. The tool is designed to work specifically with Polymorph plastic, which can be melted with hot water. First, a billet of the stuff is extruded into a cylinder, then it's inflated inside a mold with an air compressor, then allowed to cool.
As proof of concept, he made a mold for plastic bricks that could be stacked and lightly melted together to create temporary interior walls and retail displays. When finished with the bricks (or anything else made from this process), the plastic can be melted down and reused in the same way.
The video above takes us through every step of Fereday's process, from melting the plastic pellets in a bowl of hot water, extruding the material, and then inflating it in the specially designed mold.
More photos after the jump.